estrus synchronization

Summary

Summary: Occurrence or induction of ESTRUS in all of the females in a group at the same time, applies only to non-primate mammals with ESTROUS CYCLE.

Top Publications

  1. ncbi Estrus and pregnancy after synchrony with lutalyse in conjunction with Syncro-Mate-B
    S N Johnson
    Animal and Veterinary Sciences Department. Clemson University, SC, USA
    Theriogenology 55:1787-95. 2001
  2. ncbi Estrus synchronization in beef cows: comparison between GnRH+PGF2alpha+GnRH and PRID+PGF2alpha+eCG
    J P Mialot
    École Vétérinaire d Alfort, Unité Mixte de Recherche INRA ENVA 1190, 7 av du Général De Gaulle, 94704 Maisons Alfort cedex, France
    Theriogenology 60:319-30. 2003
  3. ncbi Pregnancy rates after timed AI of heifers following removal of intravaginal progesterone inserts
    I D Peeler
    Department of Dairy Science, Virginia Polytechnic Institute, Blacksburg, VA 24061, USA
    J Dairy Sci 87:2868-73. 2004
  4. pmc Ovarian and endocrine responses associated with the treatment of cystic ovarian follicles in dairy cows with gonadotropin releasing hormone and prostaglandin F2alpha, with or without exogenous progesterone
    Divakar J Ambrose
    Livestock Development Division, Alberta Agriculture Food and Rural Development, 6903 116 Street, Edmonton, Alberta T6H 5Z2
    Can Vet J 45:931-7. 2004
  5. ncbi Optimizing ovulation to first GnRH improved outcomes to each hormonal injection of ovsynch in lactating dairy cows
    N M Bello
    Department of Animal Science, Michigan State University, East Lansing, Michigan 48824, USA
    J Dairy Sci 89:3413-24. 2006
  6. ncbi Photoperiod length and the estrus synchronization protocol used before AI affect the twin pregnancy rate in dairy cattle
    C Andreu-Vázquez
    Department of Animal Health and Anatomy, Autonomous University of Barcelona, Barcelona, Spain
    Theriogenology 78:1209-16. 2012
  7. ncbi Effect of intrauterine infusion of ceftiofur on uterine health and fertility in dairy cows
    K N Galvao
    Department of Clinical Sciences, Cornell University, Ithaca, NY 14853, USA
    J Dairy Sci 92:1532-42. 2009
  8. ncbi Use of Ovsynch in dairy herds--differences between primiparous and multiparous cows
    Bernd Alois Tenhagen
    Clinic for Reproduction, Free University of Berlin, Section of Production Medicine and Quality Management, Koenigsweg 63, D 14163, Berlin, Germany
    Anim Reprod Sci 81:1-11. 2004
  9. ncbi Pattern and manipulation of follicular development in Bos indicus cattle
    G A Bo
    Instituto de Reproducción Animal Córdoba, J L de Cabrera 106, X5000GVD Córdoba, Argentina
    Anim Reprod Sci 78:307-26. 2003
  10. ncbi Timed artificial insemination with estradiol cypionate or insemination at estrus in high-producing dairy cows
    R L A Cerri
    Veterinary Medicine Teaching and Research Center, University of California Davis, Tulare 93274, USA
    J Dairy Sci 87:3704-15. 2004

Research Grants

  1. Perireceptor Contributions to Chemical Communication
    Randall Reed; Fiscal Year: 2007
  2. PHEROMONES--IDENTIFICATION/BIOCHEMICAL STUDIES
    Milos Novotny; Fiscal Year: 2001
  3. Defining the Mechanisms involved in Luteolysis
    Milo C Wiltbank; Fiscal Year: 2010
  4. Modeling Complex Adaptive Social Behavior
    Jeffrey Schank; Fiscal Year: 2007
  5. TEMPORAL INTEGRATION OF PHOTOPERIODIC SIGNALS IN MAMMALS
    Michael R Gorman; Fiscal Year: 2010

Detail Information

Publications205 found, 100 shown here

  1. ncbi Estrus and pregnancy after synchrony with lutalyse in conjunction with Syncro-Mate-B
    S N Johnson
    Animal and Veterinary Sciences Department. Clemson University, SC, USA
    Theriogenology 55:1787-95. 2001
    ..0672). Interval to estrus, estrous response, and pregnancy rate to A1 at d 28 or end of breeding season were not affected by administration of PGF2alpha in conjunction with SMB when compared to the standard SMB protocol...
  2. ncbi Estrus synchronization in beef cows: comparison between GnRH+PGF2alpha+GnRH and PRID+PGF2alpha+eCG
    J P Mialot
    École Vétérinaire d Alfort, Unité Mixte de Recherche INRA ENVA 1190, 7 av du Général De Gaulle, 94704 Maisons Alfort cedex, France
    Theriogenology 60:319-30. 2003
    The aim of this study was to compare two protocols for estrus synchronization in suckled beef cows over a 2 years period. The population studied consisted of 172 Charolais and 168 Limousin cows from 12 and 14 beef herds, respectively...
  3. ncbi Pregnancy rates after timed AI of heifers following removal of intravaginal progesterone inserts
    I D Peeler
    Department of Dairy Science, Virginia Polytechnic Institute, Blacksburg, VA 24061, USA
    J Dairy Sci 87:2868-73. 2004
    ..0%) compared with heifers inseminated 48 (66.7%) or 72 h (50.0%) after CIDR removal. Either ECP or GnRH used in a CIDR-based TAI program in dairy heifers can achieve acceptable reproductive performance...
  4. pmc Ovarian and endocrine responses associated with the treatment of cystic ovarian follicles in dairy cows with gonadotropin releasing hormone and prostaglandin F2alpha, with or without exogenous progesterone
    Divakar J Ambrose
    Livestock Development Division, Alberta Agriculture Food and Rural Development, 6903 116 Street, Edmonton, Alberta T6H 5Z2
    Can Vet J 45:931-7. 2004
    ....
  5. ncbi Optimizing ovulation to first GnRH improved outcomes to each hormonal injection of ovsynch in lactating dairy cows
    N M Bello
    Department of Animal Science, Michigan State University, East Lansing, Michigan 48824, USA
    J Dairy Sci 89:3413-24. 2006
    ..This, in turn, optimized synchronization rate to Ovsynch...
  6. ncbi Photoperiod length and the estrus synchronization protocol used before AI affect the twin pregnancy rate in dairy cattle
    C Andreu-Vázquez
    Department of Animal Health and Anatomy, Autonomous University of Barcelona, Barcelona, Spain
    Theriogenology 78:1209-16. 2012
    ..Special attention was paid to the estrus synchronization protocol used before the AI resulting in pregnancy...
  7. ncbi Effect of intrauterine infusion of ceftiofur on uterine health and fertility in dairy cows
    K N Galvao
    Department of Clinical Sciences, Cornell University, Ithaca, NY 14853, USA
    J Dairy Sci 92:1532-42. 2009
    ..pyogenes, but did not affect the prevalence of subclinical endometritis or fertility of dairy cows already receiving PGF(2alpha)...
  8. ncbi Use of Ovsynch in dairy herds--differences between primiparous and multiparous cows
    Bernd Alois Tenhagen
    Clinic for Reproduction, Free University of Berlin, Section of Production Medicine and Quality Management, Koenigsweg 63, D 14163, Berlin, Germany
    Anim Reprod Sci 81:1-11. 2004
    ..8% versus 75.4%, P=0.003). However, the extent of the difference varied between trials. Results indicate that Ovsynch protocols are more effective in primiparous than in older cows...
  9. ncbi Pattern and manipulation of follicular development in Bos indicus cattle
    G A Bo
    Instituto de Reproducción Animal Córdoba, J L de Cabrera 106, X5000GVD Córdoba, Argentina
    Anim Reprod Sci 78:307-26. 2003
    ..indicus cattle by offering the possibility of planning AI programs without the necessity of oestrus detection and without sacrificing the overall results...
  10. ncbi Timed artificial insemination with estradiol cypionate or insemination at estrus in high-producing dairy cows
    R L A Cerri
    Veterinary Medicine Teaching and Research Center, University of California Davis, Tulare 93274, USA
    J Dairy Sci 87:3704-15. 2004
    ..Use of 1 mg of ECP to induce ovulation as part of a synchrony regimen improved reproduction at first postpartum insemination in dairy cows...
  11. ncbi Inseminations at estrus induced by presynchronization before application of synchronized estrus and ovulation
    J S Stevenson
    Department of Animal Sciences and Industry, Kansas State University, Manhattan 66506 0201, USA
    J Dairy Sci 88:399-405. 2005
    ..4 or 59 +/- 0.2 DIM). We concluded that conception rates after Heatsynch and Ovsynch were similar under these experimental conditions, and that delaying first AI improved fertility for cows inseminated after detected estrus...
  12. ncbi Ovulation failure and double ovulation in dairy cattle: risk factors and effects
    F Lopez-Gatius
    Department of Animal Production, University of Lleida, Lleida, Spain
    Theriogenology 63:1298-307. 2005
    ..The effect of milk production on double ovulation was negative, whereas lactation number was positively correlated with this factor; the highest incidence of double ovulation occurring during the mid-lactation period...
  13. ncbi Fertility following fixed-time AI or insemination at observed estrus in Ovsynch and Heatsynch programs in lactating dairy cows
    R Kasimanickam
    Department of Large Animal Clinical Sciences, Virginia Maryland Regional College of Veterinary Medicine, Virginia Polytechnic Institute and State University, Blacksburg, VA 24060, USA
    Theriogenology 63:2550-9. 2005
    ..1% versus 22.3%) were not different (P>0.1). In conclusion, it was recommended to include AI at observed estrus and fixed-time AI for cows not observed in estrus in order to improve the conception rate in synchronization protocols...
  14. ncbi Synchronization of estrus and pregnancy risk in anestrous dairy cows after treatment with a progesterone-releasing intravaginal device
    R B Walsh
    Department of Population Medicine, University of Guelph, Guelph, Ontario, Canada, N1G 2W1
    J Dairy Sci 90:1139-48. 2007
    ..87 d). These results support the efficacy of a PRID to induce estrus in previously anestrous cows. The reason, however, for the variable response between primiparous and multiparous cows was not clear...
  15. ncbi Comparison of two estrus-synchronization protocols and timed artificial insemination in dairy cattle
    P Melendez
    College of Veterinary Medicine, University of Florida, Gainesville, FL 32610, USA
    J Dairy Sci 89:4567-72. 2006
    ....
  16. ncbi Reduction in size of the ovulatory follicle reduces subsequent luteal size and pregnancy rate
    J L Vasconcelos
    , Botucatu, SP, Brazil
    Theriogenology 56:307-14. 2001
    ..05) for aspirated (3/21=14.3%) than nonaspirated (10/21=47.6%) cows. In conclusion, ovulation of smaller follicles produced lowered fertility possibly because development of smaller CL decreased circulating progesterone concentrations...
  17. ncbi Effect of climate on the response to three oestrous synchronisation techniques in lactating dairy cows
    M Alnimer
    Dipartimento di Scienze Zootecniche e Ispezione degli Alimenti, Universita degli Studi di Napoli Federico II, Portici NA, Italy
    Anim Reprod Sci 71:157-68. 2002
    ....
  18. ncbi Influence of estrus synchronization of prepubertal gilts on embryo quality
    Adam J Ziecik
    Institute of Animal Reproduction and Food Research of Polish Academy of Sciences, Olsztyn, Poland
    J Reprod Dev 51:379-84. 2005
    ..the number, quality, and in vitro development of embryos recovered from gilts following single or double estrus synchronization and superovulation. Prepubertal gilts from the single synchronization group were injected with 1500 I.U...
  19. ncbi Evaluation of two different oestrus-synchronisation methods with timed artificial insemination and resynchronisation of returns to oestrus in lactating Holstein cows
    D Cavestany
    Instituto Nacional de Investigacion Agropecuaria, INIA La Estanzuela, C Correos 39173, 70000 Colonia, Uruguay
    Anim Reprod Sci 77:141-55. 2003
    ..4%). It was concluded that the addition of a progestin to the ovsynch protocol resulted in increased pregnancy rates of cows treated during anoestrus. The benefit of including MAP with the ovsynch protocol for cycling cows is equivocal...
  20. ncbi Ovsynch versus Ultrasynch: reproductive efficacy of a dairy cattle synchronization protocol incorporating corpus luteum function
    J A A McArt
    Department of Population Medicine and Diagnostic Sciences, College of Veterinary Medicine, Cornell University, Ithaca, NY 14853, USA
    J Dairy Sci 93:2525-32. 2010
    ..The detection of estrus rate of cows in the Ultra-PGF group was 49%; better performance of an Ultrasynch management program may be achievable in a herd with a higher rate of estrus detection...
  21. ncbi Effect of different doses of prostaglandin on the area of corpus luteum, the largest follicle and progesterone concentration in the dairy cow
    A Répási
    Kenézlõ Dózsa Agricultural Ltd, Kenézlõ, Hungary
    Reprod Domest Anim 38:423-8. 2003
    ..At the same time, the decrease in the percentage changes relative to the area of CL and to the concentrations of P4 were statistically significant in both treated groups...
  22. ncbi The use of estradiol and/or GnRH in a two-dose PGF protocol for breeding management of beef heifers
    M F Martinez
    Western College of Veterinary Medicine, University of Saskatchewan, 52 Campus Drive, Saskatoon, Saskatchewan, Canada S7N 5B4
    Theriogenology 62:363-72. 2004
    ..A combination of estrus detection and timed-AI in a two-dose PGF protocol resulted in highly acceptable pregnancy rates...
  23. ncbi Reproductive performance of lactating dairy cows treated with cloprostenol, hcg and estradiol benzoate for synchronization of estrus followed by timed AI
    F Lopez-Gatius
    Department of Animal Production, University of Lleida, Spain
    Theriogenology 54:551-8. 2000
    ..study were to evaluate the reproductive performance of lactating dairy cows treated with this method of estrus synchronization and to determine the effect of decreasing the hCG-EB dose on synchronization and pregnancy rates after ..
  24. ncbi Estrus synchronization in sheep with synthetic progestagens
    Hayatu Awel
    Faculty of Veterinary Sciences, Mekelle University, P O Box 231, Mekelle, Ethiopia
    Trop Anim Health Prod 41:1521-4. 2009
    ..4 (N.S). From this preliminary investigation it appears that the lower dose of norgestomet ear implants offers better option for estrus synchronization accompanied by higher fertility.
  25. ncbi Recent advances in the synchronization of estrus and ovulation in dairy cows
    Keith L Macmillan
    Department of Veterinary Science, University of Melbourne, 250 Princes Highway, Werribee, VIC 3030, Australia
    J Reprod Dev 56:S42-7. 2010
    ....
  26. ncbi Artificial insemination outcomes in beef females using bovine sperm with a detectable fertility-associated antigen
    L R Sprott
    Department of Animal Science, Texas A and M University, College Station 77843, USA
    J Anim Sci 78:795-8. 2000
    ..Fertility-associated antigen is an important determinant for fertility potential of sperm from bulls to be used in AI breeding programs...
  27. ncbi Intravaginal progesterone insert to synchronize return to estrus of previously inseminated dairy cows
    J R Chenault
    Product Development Food Animal, Pharmacia Animal Health, Kalamazoo, MI 49001, USA
    J Dairy Sci 86:2039-49. 2003
    ..7, 12.2%) and control (30.9, 11.1%) cows did not differ significantly. The CIDR inserts improved synchrony of returns to estrus, slightly reduced PR to initial AI, but did not affect CR or PR to AI during the resynchrony period...
  28. ncbi The use of hormonal treatments to improve the reproductive performance of lactating dairy cows in feedlot or pasture-based management systems
    M C Lucy
    164 ASRC, University of Missouri, Columbia, MO, USA
    Anim Reprod Sci 82:495-512. 2004
    ..Fundamental research into anestrous, the hormonal control of the estrous cycle, and early pregnancy detection should elucidate new methods that can be used to strengthen reproductive programs on dairy farms...
  29. ncbi Melengestrol acetate blocks the preovulatory surge of luteinizing hormone, the expression of behavioral estrus, and ovulation in beef heifers
    D B Imwalle
    Department of Animal Sciences, University of Kentucky, Lexington 40546 0215, USA
    J Anim Sci 80:1280-4. 2002
    ..In contrast, none of the MGA-treated heifers exhibited estrus, LH surges, or evidence of ovulation. The results of this experiment show that MGA prevents ovulation in cattle by inhibiting the preovulatory surge of LH...
  30. ncbi The effect of embryonic death rates in cattle on the efficacy of estrus synchronization programs
    J E P Santos
    Veterinary Medicine Teaching and Research Center, University of California Davis, 18830 Road 112, Tulare, CA 93274, USA
    Anim Reprod Sci 82:513-35. 2004
    ..Improvements in reproductive programs in the future will have to focus on enhancing fertilization rates and minimizing embryonic losses to optimize conception rates in dairy and beef cattle...
  31. ncbi Inclusion of an intravaginal progesterone insert plus GnRH and prostaglandin F2alpha for ovulation control in postpartum suckled beef cows
    G C Lamb
    North Central Research and Outreach Center, University of Minnesota, Grand Rapids 55744, USA
    J Anim Sci 79:2253-9. 2001
    ..Body condition and days postpartum at initiation of the breeding season affected overall efficacy of the Cosynch and Cosynch+P protocols...
  32. ncbi Pregnancy in dairy cows after synchronized ovulation regimens with or without presynchronization and progesterone
    S Z El-Zarkouny
    Department of Animal Sciences and Industry Kansas State University, Manhattan 66506 0201, USA
    J Dairy Sci 87:1024-37. 2004
    ..Presynchronization before Ovsynch enhanced pregnancy rate...
  33. ncbi Conception rates and serum progesterone concentration in dairy cattle administered gonadotropin releasing hormone 5 days after artificial insemination
    J M Howard
    Animal and Veterinary Science Department, University of Idaho, P O Box 442330, Moscow, ID 83844, USA
    Anim Reprod Sci 95:224-33. 2006
    ..In summary, the results of this study indicated that GnRH administered 5 days after AI increased serum progesterone by developing an accessory CL but did not improve conception rates in dairy cattle...
  34. ncbi GnRH treatment at artificial insemination in beef cattle fails to increase plasma progesterone concentrations or pregnancy rates
    G A Perry
    Department of Animal and Range Sciences, Box 2170, South Dakota State University, Brookings, SD 57007, USA
    Theriogenology 71:775-9. 2009
    ..72). In summary, treatment with GnRH at time of AI had no influence on conception rates in cattle that had exhibited estrus...
  35. ncbi Estrus synchronization with pseudopregnant gilts induced by a single treatment of estradiol dipropionate
    Michiko Noguchi
    Azabu University, Kanagawa, Japan
    J Reprod Dev 56:421-7. 2010
    ..EDP) could induce pseudopregnancy in gilts and to determine the effectiveness of PGF(2alpha) treatment on estrus synchronization in EDP-induced pseudopregnant gilts...
  36. ncbi Reproduction in dairy cows following progesterone insert presynchronization and resynchronization protocols
    R C Chebel
    Veterinary Medicine Teaching and Research Center, University of California Davis, Tulare 93274, USA
    J Dairy Sci 89:4205-19. 2006
    ....
  37. ncbi A CIDR-based timed embryo transfer protocol increases the pregnancy rate of lactating repeat breeder dairy cows
    Dong Soo Son
    Animal Genetic Resources Station, National Institute of Animal Science, RDA, Namwon 590 832, Korea
    J Reprod Dev 53:1313-8. 2007
    ..01) and subsequently increased by Day 16 (P<0.01). These data suggest that the CIDR-based TET protocol can be used to effectively increase the pregnancy rate in lactating repeat breeder dairy cows...
  38. ncbi Improving the reproductive efficiency, pregnancy diagnosis and monitoring the resumption of luteal activity in indigenous damascus goats
    M R Al-Merestani
    Department of Animal Production, Faculty of Agriculture, University of Damascus, Damascus, Syria
    Reprod Domest Anim 38:36-40. 2003
    ..It is also concluded that pregnancy can be diagnosed accurately and successfully using an ultrasound pregnancy detector. In addition, ovarian activity in the Damascus goat in Syria resumes in September...
  39. ncbi Estrus synchronization and conception rate after a progesterone releasing intravaginal device (PRID) treatment from the early luteal phase in heifers
    Takenobu Kuroiwa
    Laboratory of Veterinary Reproduction, Tokyo University of Agriculture and Technology, Japan
    J Reprod Dev 51:669-73. 2005
    The objective of the present study was to evaluate estrus synchronization and conception rate after progesterone releasing intravaginal device (PRID) treatment from the early luteal phase in the presence or absence of estradiol benzoate (..
  40. ncbi The role of LH pulse frequency in ACTH-induced ovarian follicular cysts in heifers
    A Y Ribadu
    Department of Veterinary Obstetrics and Gynaecology, School of Veterinary Medicine, Rakuno Gakuen University, 582 Bunkyodai Midorimachi, Ebetsu, 069 8501, Hokkaido, Japan
    Anim Reprod Sci 64:21-31. 2000
    ..These results suggest that the LH pulse frequency observed following ACTH treatment may interact with high estradiol concentration to induce ovarian cyst formation in heifers...
  41. ncbi Influence of repeated rectal ultrasound examinations on hormone profiles and behaviour around oestrus and ovulation in dairy cattle
    Judith B Roelofs
    Department of Animal Science, Wageningen University, P O Box 338, 6700 AH Wageningen, The Netherlands
    Theriogenology 62:1337-52. 2004
    ..Further research, using ultrasound, can now be carried out to find predictors for time of ovulation...
  42. ncbi Effects of breed and progestin source on estrus synchronization and rates of fertility and fecundity in Iranian Sanjabi and Lori ewes
    M M Moeini
    Department of Animal Science, Faculty of Agriculture, Razi University, Kermanshah, Iran
    Pak J Biol Sci 10:3801-7. 2007
    ..The sheep breed influences the estrous response rate while the source of progestin did not affect the estrous response...
  43. ncbi Efficacy of Heatsynch protocol for induction of estrus, synchronization of ovulation and timed artificial insemination in yaks (Poephagus grunniens L.)
    M Sarkar
    National Research Center on Yak, Dirang, Arunachal Pradesh 790101, India
    Anim Reprod Sci 104:299-305. 2008
    ....
  44. ncbi Ovarian dynamics and milk progesterone concentrations in cycling and non-cycling buffalo-cows (Bubalus bubalis) during Ovsynch program
    A Ali
    Department of Theriogenology, Faculty of Veterinary Medicine, Assiut University, Assiut 71526, Egypt
    Theriogenology 68:23-8. 2007
    ..5% in CYC and NYC cows, respectively. Early and asynchronous ovulation and luteal sub-function seemed to be a problem in NCY cows. Inseminating NCY cows twice, at 0 and 24 h of the second GnRH is recommended...
  45. ncbi Timing of artificial insemination in postpartum beef cows following administration of the CO-Synch + controlled internal drug-release protocol
    D C Busch
    Division of Animal Science, S132 ASRC, University of Missouri, Columbia 65211, USA
    J Anim Sci 86:1519-25. 2008
    ..30), and there was no difference between treatments in final pregnancy rates (P = 0.77). In summary, pregnancy rates resulting from FTAI following CO-Synch + CIDR at 66 h were greater than those resulting from FTAI at 54 h...
  46. ncbi Fertility of holstein dairy heifers after synchronization of ovulation and timed AI or AI after removed tail chalk
    H Rivera
    Department of Dairy Science, University of Wisconsin, Madison 53706, USA
    J Dairy Sci 87:2051-61. 2004
    ..We conclude that this synchronization protocol can yield acceptable fertility in dairy heifers if AI to estrus is conducted between treatment with GnRH and PGF2alpha and AI efficiency is optimized...
  47. ncbi A modified presynchronization protocol improves fertility to timed artificial insemination in lactating dairy cows
    C Navanukraw
    Department of Animal and Range Sciences, North Dakota State University, Fargo 58105, USA
    J Dairy Sci 87:1551-7. 2004
    ..6 vs. 37.3%). Parity, DIM, and body condition score (BCS) at TAI did not affect PR/AI to TAI. These data support use of this presynchronization protocol to increase PR/ AI of lactating dairy cows receiving TAI compared with Ovsynch...
  48. ncbi Evaluation of methods of resynchronization for insemination in cows of unknown pregnancy status
    K N Galvao
    Veterinary Medicine Teaching and Research Center, University of California Davis, Tulare 93274, USA
    J Dairy Sci 90:4240-52. 2007
    ..These results indicate that the reproductive performance of dairy cows did not differ among the 3 resynchronization treatments evaluated...
  49. ncbi Resynchronizing estrus and ovulation after not-pregnant diagnosis and various ovarian states including cysts
    J S Stevenson
    Department of Animal Sciences and Industry, Kansas State University, Manhattan 66506 0201, USA
    J Dairy Sci 87:3658-64. 2004
    ....
  50. ncbi Factors influencing upfront single-and multiple-ovulation incidence, progesterone, and luteolysis before a timed insemination resynchronization protocol
    J S Stevenson
    Department of Animal Sciences and Industry, Kansas State University, Manhattan 66506 0201
    J Dairy Sci 90:5542-51. 2007
    ....
  51. ncbi The reproductive performance of dairy cows with anovulatory anoestrus that were injected with either gonadotrophin-releasing hormone or oestradiol benzoate as part of a re-treatment process after insemination
    B V E Segwagwe
    Faculty of Veterinary Science, The University of Melbourne, 250 Princes Highway, Werribee, 3030, Victoria, Australia
    J S Afr Vet Assoc 78:6-11. 2007
    ..Its use affected neither conception rates to the preceding 1st inseminations nor to the following 2nd inseminations...
  52. ncbi [Synchronization of ovulation (OVSYNCH) in high producing dairy cattle herds. Part II: Milk yield, diseases and cost-benefit-analysis]
    H P Klindworth
    Tiergesundheitsdienste der Landwirtschaftskammer Hannover
    Dtsch Tierarztl Wochenschr 111:142-7. 2004
    ..The cost-benefit-analysis revealed higher total cost, and cost per pregnancy (16,408.07 euros and 278.10 euros, respectively) in the control group than in the OVSYNCH group (11,015.69 euros and 196.71 euros, respectively)...
  53. ncbi Estradiol benzoate given 0 or 24 h after the end of a progestagen treatment in postpartum suckled beef cows
    Pablo Juan Ross
    Escuela de Posgrado en Producción Animal, Facultad de Ciencias Agrarias, Universidad Nacional de Mar del Plata, C C 276 Balcarce 7620, Argentina
    Theriogenology 62:265-73. 2004
    ....
  54. ncbi A comparison of progestin-based protocols to synchronize estrus in postpartum beef cows
    J E Stegner
    Department of Animal Science, University of Missouri, Columbia 65211, USA
    J Anim Sci 82:1016-21. 2004
    Two progestin-based protocols for estrus synchronization in postpartum beef cows were compared following treatment administration on the basis of estrous response, interval to and synchrony of estrus, and pregnancy...
  55. ncbi A comparison of progestin-based protocols to synchronize ovulation and facilitate fixed-time artificial insemination in postpartum beef cows
    J F Bader
    Department of Animal Science, University of Missouri, Columbia 65211, USA
    J Anim Sci 83:136-43. 2005
    ..Both protocols provide opportunities for beef producers to use AI and eliminate the need to detect estrus...
  56. ncbi Resynchronization of ovulation and timed insemination in lactating dairy cows III. Administration of GnRH 23 days post AI and ultrasonography for nonpregnancy diagnosis on day 30
    J A Bartolome
    Department of Animal Sciences, University of Florida, 459 Shealy Drive, Gainesville, FL 32611 0910, USA
    Theriogenology 63:1643-58. 2005
    ..The CIDR insert increased pregnancy rate in cows with ovarian cysts but reduced pregnancy rate for cows in proestrus...
  57. ncbi Synchronization of estrus in suckled beef cows for detected estrus and artificial insemination and timed artificial insemination using gonadotropin-releasing hormone, prostaglandin F2alpha, and progesterone
    J E Larson
    North Central Research and Outreach Center, University of Minnesota, Grand Rapids, 55744, USA
    J Anim Sci 84:332-42. 2006
    ..We conclude that the CO-Synch + CIDR protocol yielded similar pregnancy rates to estrous detection protocols and is a reliable TAI protocol that eliminates detection of estrus when inseminating beef cows...
  58. ncbi The timing of ovulation and insemination schedules in superstimulated cattle
    Gabriel A Bó
    Instituto de Reproducción Animal Córdoba IRAC, J L de Cabrera 106, X5000GVD Córdoba, Argentina
    Theriogenology 65:89-101. 2006
    ..These protocols facilitate the application of on-farm embryo transfer programs because they are practical, easy to administer by farm personnel, and more importantly, they eliminate the need for detecting estrus...
  59. ncbi Dissecting why superovulation and embryo transfer usually work on some farms but not on others
    B Stroud
    Stroud Veterinary Embryo Services Inc, Weatherford, TX 76087, USA
    Theriogenology 65:65-76. 2006
    ..However, PGF is limited in its effectiveness early and late in the bovine estrus cycle. Recipient estrus synchronization with progesterone releasing intravaginal inserts has been successful and high pregnancy rates have ..
  60. ncbi Comparison of an oestrus synchronisation protocol with oestradiol benzoate and PGF2alpha and insemination at detected oestrus to a timed insemination protocol (Ovsynch) on reproductive performance of lactating dairy cows
    Mufeed A Alnimer
    Department of Animal Production, Faculty of Agriculture, University of Jordan, Amman 11942, Jordan
    Reprod Nutr Dev 45:699-708. 2005
    ..6 +/- 3). The results indicate that pregnancy rates for first AI were similar, but overall pregnancy rates up to the fourth AI tended to be higher for OVS than EPE cows, while days open was tended to be lower for OVS than EPE cows...
  61. ncbi Manipulation and control of the estrous cycle in pasture-based dairy cows
    J Cavalieri
    Probreed RMS Pty Ltd, 509 Penshurst Port Fairy Road, Kirkstall 3283, Australia
    Theriogenology 65:45-64. 2006
    ..Synchronization of estrus and ovulation can be enhanced by administration of EB or GnRH during proestrus, but dose, timing and stage of follicular development at the time of treatment can affect outcomes...
  62. ncbi Pregnancy rates to timed artificial insemination in Holstein heifers given prostaglandin F2alpha twenty-four hours before or concurrent with removal of an intravaginal progesterone-releasing insert
    D J Ambrose
    Dairy Research and Technology Centre, Alberta Agriculture and Rural Development, Edmonton, Alberta, Canada T6H 5T6
    J Dairy Sci 91:2678-83. 2008
    ....
  63. ncbi Resynchronization of previously timed-inseminated beef heifers with progestins
    M G Colazo
    WCVM, University of Saskatchewan, Saskatoon, SK, Canada S7N 5B4
    Theriogenology 65:557-72. 2006
    ..Fertility was higher in heifers resynchronized with a once-used CIDR than with MGA...
  64. ncbi Induction of estrus in suckled female yaks (Bos grunniens) and synchronization of ovulation in the non-sucklers for timed artificial insemination using progesterone treatments and Co-Synch regimens
    Xiang Dong Zi
    College of Life Science and Technology, Southwest University for Nationalities, Chengdu, Sichuan 610041, PR China
    Anim Reprod Sci 92:183-92. 2006
    ..This technique and Co-Synch regimen can be applied successfully for TAI of non-suckled yak cows...
  65. ncbi Evaluation of progesterone supplementation in a prostaglandin F2alpha-based presynchronization protocol before timed insemination
    R C Bicalho
    Department of Population Medicine and Diagnostic Sciences, College of Veterinary Medicine, Cornell University, Ithaca, NY 14853 6401, USA
    J Dairy Sci 90:1193-200. 2007
    ..Earlier expression of estrus after the second PGF2alpha injection, and consequently improper timing of initiation of the Ovsynch protocol, could have negatively affected fertility in the CIDR-treated cows...
  66. ncbi Effect of administration of human chorionic gonadotropin after artificial insemination on concentrations of progesterone and conception rates in beef heifers
    R N Funston
    University of Nebraska, West Central Research and Extension Center, North Platte, 69101, USA
    J Anim Sci 83:1403-5. 2005
    ....
  67. ncbi Ovarian traits after gonadotropin-releasing hormone-induced ovulation and subsequent delay of induced luteolysis in an Ovsynch protocol
    J S Stevenson
    Department of Animal Sciences and Industry, Kansas State University, Manhattan 66506 0201, USA
    J Dairy Sci 90:1281-8. 2007
    ..6%), 5/9 (55.6%), and 1/10 (10%), respectively. We conclude that delaying PGF2alpha injection by 24 h had no effect on outcomes...
  68. ncbi Use of intravaginal progesterone-releasing inserts in a synchronization protocol before timed AI and for synchronizing return to estrus in Holstein heifers
    H Rivera
    Department of Dairy Science, University of Wisconsin, Madison, WI 53706, USA
    J Dairy Sci 88:957-68. 2005
    ..Resynchronization of estrus using CIDR inserts resulted in tighter synchrony of estrus among nonpregnant heifers compared with untreated controls...
  69. pmc Resynchronization of estrus in beef cattle: ovarian function, estrus and fertility following progestin treatment and treatments to synchronize ovarian follicular development and estrus
    Marcos G Colazo
    Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, Saskatchewan S7N 5B4
    Can Vet J 48:49-56. 2007
    ..1% versus 39.2%, P < 0.05) in heifers given a used IVPRI than those fed MGA. For resynchronization of heifers, pregnancy rates were not significantly improved with GnRH treatment, but were higher with a used IVPRI than with MGA...
  70. ncbi Effect of presynchronization using prostaglandin F2alpha and a milk-ejection test on pregnancy rate after the timed artificial insemination protocol, Ovsynch
    B R Keith
    Department of Animal and Poultry Science, University of Guelph, Guelph, Ont, N1G 2W1, Canada
    Theriogenology 63:722-38. 2005
    ..Initiating the Ovsynch protocol between days 5 and 9 of the cycle increased PR, and improved the efficacy of each injection...
  71. ncbi Timing of follicular phase events and the postovulatory progesterone rise following synchronisation of oestrus in cows
    G R Starbuck
    University of Nottingham, School of Biosciences, Division of Animal Physiology, Sutton Bonington, Loughborough LE12 5RD, UK
    Vet J 172:103-8. 2006
    ..However, the data do suggest that in cows with poor post ovulatory progesterone secretion, the key problem appears to be poor post ovulatory development rather than a delay in ovulation...
  72. ncbi The control of follicular wave development for self-appointed embryo transfer programs in cattle
    G A Bo
    Instituto de Reproducción Animal Córdoba IRAC, J L de Cabrera 106, X5000GVD Córdoba, Argentina
    Theriogenology 57:53-72. 2002
    ....
  73. ncbi Evaluation of synchronization of oestrus based on gonadotrophin-releasing hormone and its potential use for fixed-time breeding in Tuli beef cows
    W Muruvi
    Henderson Research Station, Mazowe, Zimbabwe
    Trop Anim Health Prod 33:431-40. 2001
    ..However, the benefit might be greater if only cows that are known to be cycling are bred in this way...
  74. ncbi Evaluation of a fixed-time artificial insemination protocol for postpartum suckled beef cows
    G A Perry
    Department of Animal Science, University of Missouri, Columbia 65211, USA
    J Anim Sci 80:3060-4. 2002
    ..In summary, pregnancy rates resulting from fixed-time AI may be improved with treatment of MGA prior to a GnRH-PG-GnRH protocol...
  75. ncbi Influence of CIDR treatment during superovulation on embryo production and hormonal patterns in cattle
    M Lafri
    UNCEIA Services Techniques, Maisons Alfort, France
    Theriogenology 58:1141-51. 2002
    ..Further studies are needed to know if results may be improved when making AI at a later time after standing estrus or if LH assays are useful to better monitor AI time...
  76. ncbi Synchronisation of oestrus and reproductive performance of dairy cows following administration of oestradiol benzoate or gonadotrophin releasing hormone during a synchronised pro-oestrus
    J Cavalieri
    Department of Veterinary Science, The University of Melbourne, Werribee, Victoria
    Aust Vet J 80:486-93. 2002
    ....
  77. ncbi The use of a progesterone-releasing device (CIDR-B) or melengestrol acetate with GnRH, LH, or estradiol benzoate for fixed-time AI in beef heifers
    M F Martinez
    Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, Canada
    J Anim Sci 80:1746-51. 2002
    ..6 vs 51.9%; P < 0.05). In conclusion, GnRH, pLH, or EB treatment in combination with a CIDR-B device or MGA effectively synchronized ovulation-for fixed-time AI, resulting in acceptable pregnancy rates in beef heifers...
  78. ncbi The effect of timing of administration of oestradiol benzoate on characteristics of oestrus, timing of ovulation and fertility in Bos indicus heifers synchronised with a progesterone releasing intravaginal insert
    J Cavalieri
    Department of Veterinary Science, University of Melbourne, Werribee, Victoria
    Aust Vet J 80:217-23. 2002
    ..Design: Cohort study...
  79. ncbi Stage of cycle, incidence, and timing of ovulation, and pregnancy rates in dairy cattle after three timed breeding protocols
    J A Cartmill
    Department of Animal Sciences and Industry, Kansas State University, Manhattan 66506-0201, USA
    J Dairy Sci 84:1051-9. 2001
    ..In multiparous cows, PGF2alpha before Ovsynch increased pregnancy rates, whereas the 2xPG12 protocol produced similar pregnancy rates as Ovsynch across parities. Ovulation was effectively induced by 40 h after GnRH...
  80. ncbi Comparison of three approaches for synchronization of ovulation for timed artificial insemination in Bos indicus-influenced cattle managed on the Texas gulf coast
    S W Williams
    Animal Reproduction Laboratory, Texas A and M University Agricultural Research Station, Beeville 78102 9410, USA
    J Anim Sci 80:1173-8. 2002
    ..However, in nulliparous Brahman-influenced heifers that are confirmed to be pubertal, NP may be superior to the other two treatments for timed AI...
  81. ncbi Comparison of pregnancy rates with two estrus synchronization protocols in Italian Mediterranean Buffalo cows
    Gianluca Neglia
    Dipartimento di Scienze Zootecnichee Ispezione degli Alimenti DISCIZIA, Faculty of Veterinary Medicine Federico II University, Naples 80137, Italy
    Theriogenology 60:125-33. 2003
    The aim in this study was to compare two estrus synchronization protocols in buffaloes...
  82. ncbi Supplemental norgestomet, progesterone, or melengestrol acetate increases pregnancy rates in suckled beef cows after timed inseminations
    J S Stevenson
    Department of Animal Sciences and Industry, Kansas State University, Manhattan 66506 0201, USA
    J Anim Sci 81:571-86. 2003
    ..Injection of GnRH at TAI following the Cosynch + CIDR protocol increased pregnancy rates in cycling cows with high P4 before the PGF2alpha injection and in anestrous cows with low P4 before PGF2alpha injection...
  83. ncbi Application of timed artificial insemination protocols to grazing Japanese black cattle with long open period
    Takeshi Osawa
    Laboratory of Theriogenology, Faculty of Agriculture, Iwate University, Ueda, Morioka, Japan
    J Vet Med Sci 65:459-64. 2003
    ..0% and 88.0%, respectively. These figures were comparable to the PR obtained by conventional estrus synchronization protocols using PG (in 1995; 69.4%) or CIDR (in 1996; 59.1%)...
  84. ncbi Characteristics of estrus before and after first insemination and fertility of heifers after synchronized estrus using GnRH, PGF2alpha, and progesterone
    A M Richardson
    Department of Animal Sciences and Industry, Kansas State University, Manhattan 66506 0201, USA
    J Anim Sci 80:2792-800. 2002
    ..01) than those observed during the next eligible estrus before second AI, whereas duration of estrus was unaffected...
  85. ncbi Effect of a deslorelin implant in a timed artificial insemination protocol on follicle development, luteal function and reproductive performance of lactating dairy cows
    J E P Santos
    Veterinary Medicine Teaching and Research Center, University of California Davis, Tulare, CA 93274, USA
    Theriogenology 61:421-35. 2004
    ..Evaluation of lower doses to minimize the negative effects on subsequent fertility is warranted...
  86. ncbi Resynchronization of estrus in cattle of unknown pregnancy status using estrogen, progesterone, or both
    J S Stevenson
    Department of Animal Sciences and Industry, Kansas State University, Manhattan 66506 0201, USA
    J Anim Sci 81:1681-92. 2003
    ....
  87. ncbi Luteal activity at the onset of a timed insemination protocol affects reproductive outcome in early postpartum dairy cows
    K Murugavel
    Department of Animal Production, University of Lleida, Lleida, Spain
    Theriogenology 60:583-93. 2003
    ..These findings suggest the importance of establishing ovarian status in early postpartum dairy cows before starting a timed AI protocol, in terms of luteal activity assessed by blood progesterone...
  88. ncbi Estrus synchronization in dairy goats: use of fluorogestone acetate vaginal sponges or norgestomet ear implants
    V J Freitas
    I N R A Reproductive Physiology of Domestic Mammals, Nouzilly, France
    Anim Reprod Sci 46:237-44. 1997
    The ultimate aim of any estrus synchronization method is to allow artificial insemination at a predetermined time after the end of treatment...
  89. ncbi Effects of natural (RRR alpha-tocopherol acetate) or synthetic (all-rac alpha-tocopherol acetate) vitamin E supplementation on reproductive efficiency in beef cows
    M Horn
    Department of Animal Sciences, Purdue University, West Lafayette, IN 47907, USA
    J Anim Sci 88:3121-7. 2010
    ..1) or 7 and 14 d before estrus synchronization (Exp. 2) to determine return to estrus via progesterone concentration...
  90. ncbi Use of progestagen-gonadotrophin treatments in estrus synchronization of sheep
    C M Boscos
    Department of Clinical Studies, Faculty of Veterinary Medicine, Aristotle University of Thessaloniki, Greece
    Theriogenology 58:1261-72. 2002
    ..During the mid-breeding season FSH (10 IU) appears to be equally as effective as eCG (400 IU) in respect of lambing rate and mean number of lambs born per ewe...
  91. ncbi Steroid priming shortens prostaglandin-based estrus synchronization program from 14 to 7 days in cattle
    A Niasari-Naslaji
    Department of Clinical Sciences, Faculty of Veterinary Medicine, University of Tehran, Iran
    Theriogenology 56:735-43. 2001
    ..and progesterone before prostaglandin (steroid priming) was used to shorten the prostaglandin-based estrus synchronization program...
  92. ncbi Use of Chronogest implants and Folltropin for estrus synchronization and superovulation in goats
    M Taneja
    Embryo Biotechnology Laboratory, National Institute of Immunology, New Delhi, India
    Indian J Exp Biol 29:1079-80. 1991
    ..05) between the treatment groups in recovery of transferable embryos, however, 14 mg folltropin appeared to be near optimal dose. There was no adverse effect on the quality of recovered embryos with high doses of folltropin...
  93. ncbi Synchronization of estrus with PGF2 alpha administered 18 days after a progesterone treatment in lactating dairy cows
    Z Z Xu
    Livestock Improvement Corporation, Hamilton, New Zealand
    Theriogenology 50:905-15. 1998
    In a previous study we showed that estrus synchronization with 2 treatments of PGF2 alpha 13 d apart reduced conception rate at the synchronized estrus and that this reduction occurred mainly in cows in the early luteal phase at the ..
  94. ncbi The strategic use of estradiol to enhance fertility and submission rates of progestin-based estrus synchronization programs in dairy herds
    M L Day
    Department of Animal Sciences, The Ohio State University, Columbus, USA
    J Anim Sci 78:523-9. 2000
    Two experiments were performed to evaluate the efficacy of a progestin-based estrus synchronization program that incorporated the use of estradiol at the initiation of progestin treatment and at 48 h after progestin withdrawal (Exp. 2)...
  95. ncbi Comparison of long-term progestin-based estrus synchronization protocols in beef heifers
    D A Mallory
    Division of Animal Science, S132 ASRC, University of Missouri, Columbia, 65211, USA
    J Anim Sci 88:3568-78. 2010
    ..1) between treatments. In summary, the Show-Me-Synch protocol compared favorably with the MGA-PG protocol on the basis of estrous response, synchrony of estrus, and resulting fertility after treatment administration...
  96. ncbi Control of the estrous cycle to improve fertility for fixed-time artificial insemination in beef cattle: a review
    G C Lamb
    North Florida Research and Education Center, University of Florida, Marianna, FL 32446, USA
    J Anim Sci 88:E181-92. 2010
    ..noncycling cows is likely the primary manner in which beef producers may improve fertility in response to estrus synchronization and TAI protocols...
  97. ncbi Prolonging the MGA-prostaglandin F2 alpha interval from 17 to 19 days in an estrus synchronization system for heifers
    G C Lamb
    North Central Experiment Station, University of Minnesota, Grand Rapids 55744, USA
    Theriogenology 53:691-8. 2000
    ....
  98. ncbi Premature prostaglandin F2alpha secretion causes luteal regression in GnRH-induced short estrous cycles in cyclic dairy heifers
    Juhani Taponen
    Department of Clinical Veterinary Sciences, Faculty of Veterinary Medicine, University of Helsinki, Saari Unit, Pohjoinen Pikatie 800, 04920 Saarentaus, Mäntsälä, Finland
    Theriogenology 60:379-93. 2003
    ..Twenty-four Ayrshire heifers were allotted to four equally sized groups. After estrus synchronization with 0.5mg of Clp, a new luteolysis was induced with 0...
  99. ncbi Comparison of two timed artificial insemination (TAI) protocols for management of first insemination postpartum
    E R Jordan
    Department of Animal Science, Texas A and M University, College Station 77843, USA
    J Dairy Sci 85:1002-8. 2002
    ....
  100. ncbi Male-induced estrus synchronization in the female Siberian hamster (Phodopus sungorus sungorus)
    James C Dodge
    Behavioral Neuroscience Program, Department of Psychology, University at Buffalo, Buffalo, NY, USA
    Physiol Behav 77:227-31. 2002
    ..has focused on how male-emitted priming pheromones, such as those that regulate the onset of puberty and estrus synchronization in females, affect the reproductive physiology of the female Siberian hamster (Phodopus sungorus sungorus)...
  101. ncbi Endocrine events during the periestrous period and the subsequent estrous cycle in ewes after estrus synchronization
    J Menegatos
    Laboratory of Anatomy and Physiology of Domestic Animals, Department of Animal Science, Agricultural University of Athens, 75 Iera Odos, Greece
    Theriogenology 59:1533-43. 2003
    ..05) in the implant group. It is concluded that the kind of progesterone treatment may affect the time of estrus and the LH peak as well as the progesterone levels of the subsequent cycle...

Research Grants5

  1. Perireceptor Contributions to Chemical Communication
    Randall Reed; Fiscal Year: 2007
    ..to elicit important responses such as intermale aggression, sexual arousal, puberty acceleration, and estrus synchronization. In many mammals, including humans, these communication stimuli have been identified as small hydrophobic, ..
  2. PHEROMONES--IDENTIFICATION/BIOCHEMICAL STUDIES
    Milos Novotny; Fiscal Year: 2001
    ..of the rats, deermice, and hamsters will be synthesized and tested for the endocrinological activities (estrus synchronization and puberty delay) and a variety of behavioral effects...
  3. Defining the Mechanisms involved in Luteolysis
    Milo C Wiltbank; Fiscal Year: 2010
    ..Completion of this research will validate a new in vivo model for luteolysis and provide insight into the interactions of specific gene expression cascades and signal transduction pathways during luteolysis. ..
  4. Modeling Complex Adaptive Social Behavior
    Jeffrey Schank; Fiscal Year: 2007
    ..Finally, these models will be used to develop Monte Carlo statistical approaches for studying the behavioral development of complex adaptive systems. [unreadable] [unreadable]..
  5. TEMPORAL INTEGRATION OF PHOTOPERIODIC SIGNALS IN MAMMALS
    Michael R Gorman; Fiscal Year: 2010
    ..Finally, these studies form a necessary information base to evaluate the potential physiological costs and benefits of artificial lighting regimes experienced by humans in modern society. ..