Efficacy of PGF(2alpha) to synchronize estrus in water buffalo cows (Bubalus bubalis) is dependent upon plasma progesterone concentration, corpus luteum size and ovarian follicular status before treatmentL F C Brito
Faculty of Veterinary Medicine, Federal University of Uberlandia, Uberlandia MG, Brazil
Anim Reprod Sci 73:23-35. 2002
..In summary, the efficacy of PGF(2alpha) for causing luteolysis and synchronizing estrus and ovulation in buffalo cows was dependent upon plasma progesterone concentration, CL size and ovarian follicular status before treatment...
- Effect of nutrition during calfhood and peripubertal period on serum metabolic hormones, gonadotropins and testosterone concentrations, and on sexual development in bulls
Leonardo F C Brito
Western College of Veterinary Medicine, University of Saskatchewan, 52 Campus Dr, Saskatoon, Sask, Canada S7H 4B5
Domest Anim Endocrinol 33:1-18. 2007
..Therefore, gonadotropin-independent mechanism regulating testicular growth might be dependent on previous gonadotropin milieu...
Testicular vascular cone development and its association with scrotal temperature, semen quality, and sperm production in beef bullsLeonardo F C Brito
Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, SK, Canada
Anim Reprod Sci 134:135-40. 2012
..Increased testicular vascular cone diameter and decreased distance between arterial and venous blood were associated with increased percentage of normal sperm and decreased percentages of sperm defects...
- Testicular ultrasonogram pixel intensity during sexual development and its relationship with semen quality, sperm production, and quantitative testicular histology in beef bulls
L F C Brito
Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
Theriogenology 78:69-76. 2012
..In conclusion, although testicular ultrasonogram pixel intensity analysis might be useful for research purposes, clinical application of this technology in the present form for bull breeding soundness evaluation is not justifiable...
- Effect of growth rate from 6 to 16 months of age on sexual development and reproductive function in beef bulls
L F C Brito
Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
Theriogenology 77:1398-405. 2012
..6 kg/day did not result in excessive fat accumulation in the scrotum, increased scrotal temperature, or reduction in sperm production and semen quality, and could be considered "safe" targets for growing beef bulls...
- Effect of improved nutrition during calfhood on serum metabolic hormones, gonadotropins, and testosterone concentrations, and on testicular development in bulls
Leonardo F C Brito
Western College of Veterinary Medicine, University of Saskatchewan, 52 Campus Dr Saskatoon, Sask S7H 4B5, Canada
Domest Anim Endocrinol 33:460-9. 2007
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- Effect of feed restriction during calfhood on serum concentrations of metabolic hormones, gonadotropins, testosterone, and on sexual development in bulls
L F C Brito
Western College of Veterinary Medicine, University of Saskatchewan, 52 Campus Dr, Saskatoon, Saskatchewan, Canada S7N 5B4
Reproduction 134:171-81. 2007
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- Bilateral testicular mixed germ cell-sex cord-stromal tumours in a stallion
L F C Brito
Department of Clinical Studies, School of Veterinary Medicine, New Bolton Centre, University of Pennsylvania, Kennett Square, Pennsylvania 19348, USA
Reprod Domest Anim 44:846-51. 2009
..Our findings indicate that certain ultrasonographic characteristics are suggestive of testicular tumour and that immunohistochemistry markers can be used to better characterize testicular neoplasms in stallions...
- Semen characteristics in a sub-fertile Arabian stallion with idiopathic teratospermia
L F C Brito
Department of Clinical Studies New Bolton Center, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA, USA
Reprod Domest Anim 45:354-8. 2010
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- Sperm ultrastructure, morphometry, and abnormal morphology in American black bears (Ursus americanus)
L F C Brito
Department of Clinical Sciences New Bolton Center, School of Veterinary Medicine, University of Pennsylvania, Kennett Square, PA, USA
Theriogenology 74:1403-13. 2010
..The morphology of abnormal sperm and the underlying ultrastructural defects were similar to that in other large domestic animals thus suggesting similar underlying pathogenesis of specific sperm defects and similar effects on fertility...
- Effect of method and clinician on stallion sperm morphology evaluation
Leonardo F C Brito
Department of Clinical Studies New Bolton Center, School of Veterinary Medicine, University of Pennsylvania, Kennett Square, Pennsylvania, USA
Theriogenology 76:745-50. 2011
..Veterinary andrology laboratories should invest in training, continuing education, proficiency testing, and other quality control measures to minimize the variation of sperm morphology evaluation results among clinicians...
- Effect of age and genetic group on characteristics of the scrotum, testes and testicular vascular cones, and on sperm production and semen quality in AI bulls in Brazil
L F C Brito
Department of Animal Reproduction and Veterinary Radiology, FMVZ, UNESP, Botucatu, SP, Brazil
Theriogenology 58:1175-86. 2002
..In addition, characteristics of the scrotum, testes and TVC were associated with sperm production and semen quality in bulls and could be assessed for breeding soundness evaluation...
- Sexual development in early- and late-maturing Bos indicus and Bos indicus x Bos taurus crossbred bulls in Brazil
Leonardo F C Brito
Department of Large Animal Clinical Sciences, Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, Sask, S7N 5B4, Canada
Theriogenology 62:1198-217. 2004
..Yearling SC could be used to select bulls for sexual precocity and SC was the best predictor of pubertal status. Age, weight, and SC were equally good predictors of sexual maturity in B. indicus bulls...
- Effects of scrotal insulation on sperm production, semen quality, and testicular echotexture in Bos indicus and Bos indicus x Bos taurus bulls
Leonardo F C Brito
Department of Large Animal Clinical Sciences, Western College of Veterinary Medicine, University of Saskatchewan, 52 Campus Drive, SK, Saskatoon, Canada S7N 5B4
Anim Reprod Sci 79:1-15. 2003
..In conclusion, whole-scrotum insulation resulted in decreased sperm production and semen quality in B. indicus and B. indicus x B. taurus bulls, but those changes were not associated with changes in testicular echotexture...
- Comparison of methods to evaluate the plasmalemma of bovine sperm and their relationship with in vitro fertilization rate
Leonardo F C Brito
Department of Large Animal Clinical Sciences, Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, SK, Canada
Theriogenology 60:1539-51. 2003
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- Relationship between semen quality and pixel-intensity of testicular ultrasonograms after scrotal insulation in beef bulls
Andres A Arteaga
Department of Large Animal Clinical Sciences, Western College of Veterinary Medicine, University of Saskatchewan, 52 Campus Drive, Saskatoon, SK, S7N 5B4, Canada
Theriogenology 64:408-15. 2005
..Testicular ultrasonogram pixel-intensity had a better association with future semen quality than with present semen quality and was a better predictor of unsatisfactory semen quality than satisfactory semen quality...
- Testicular thermoregulation in Bos indicus, crossbred and Bos taurus bulls: relationship with scrotal, testicular vascular cone and testicular morphology, and effects on semen quality and sperm production
Leonardo F C Brito
Department of Animal Reproduction and Veterinary Radiology, FMVZ, UNESP, Botucatu, SP, Brazil
Theriogenology 61:511-28. 2004
..taurus bulls. Scrotal, TVC, and testicular morphology influence testicular thermoregulatory capability and were associated with differences in semen quality and sperm production...
- Effects of intratesticular zinc gluconate treatment on testicular dimensions, echodensity, histology, sperm production, and testosterone secretion in American black bears (Ursus americanus)
Leonardo F C Brito
Department of Clinical Sciences, University of Pennsylvania, PA, USA
Theriogenology 75:1444-52. 2011
..We inferred that normal fertility might have been compromised, but treatment unlikely resulted in sterility...
- Effects of environmental factors, age and genotype on sperm production and semen quality in Bos indicus and Bos taurus AI bulls in Brazil
L F C Brito
Department of Animal Reproduction and Veterinary Radiology, FMVZ, UNESP, Botucatu, SP, Brazil
Anim Reprod Sci 70:181-90. 2002
..B. indicus bulls had significantly greater sperm concentration and B. taurus bulls had significantly fewer morphologically defective spermatozoa...
- Use of internal artificial vaginas for breeding soundness evaluation in range bulls: an alternative for electroejaculation allowing observation of sex drive and mating ability
Albert D Barth
Department of Large Animal Clinical Sciences, Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, Saskatchewan, Canada S7N 5B4
Anim Reprod Sci 84:315-25. 2004
..Semen collection by IAV also allows observation of sex drive and mating ability thus improves the ability to select sound breeding bulls...
- Follicular dynamics and plasma FSH and progesterone concentrations during follicular deviation in the first post-ovulatory wave in Nelore (Bos indicus) heifers
Caliê Castilho
Universidade do Oeste Paulista, Presidente Prudente, SP, Brazil
Anim Reprod Sci 98:189-96. 2007
..Variations in FSH concentrations within 12-h intervals were not involved in follicular deviation in Nelore heifers...
- Use of oxytocin and cloprostenol to facilitate semen collection by electroejaculation or transrectal massage in bulls
C W Palmer
Department of Large Animal Clinical Sciences, University of Saskatchewan, Saskatoon, Sask, Canada S7N 5B4
Anim Reprod Sci 80:213-23. 2004
..The usefulness of transrectal massage for semen collection in breeding soundness evaluations needs to be investigated further under field conditions...
- The effect of nutrition on sexual development of bulls
A D Barth
Department of Large Animal Clinical Sciences, Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
Theriogenology 70:485-94. 2008
..These studies confirmed that superior calfhood nutrition augmented gonadotropin secretion (which is probably mediated by metabolic hormones); this resulted in larger testes at 1 y of age and an earlier onset of spermatogenesis...
- Comparison of electroejaculation and transrectal massage for semen collection in range and yearling feedlot beef bulls
C W Palmer
Department of Large Animal Clinical Sciences, Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, Sask, Canada S7N 5B4
Anim Reprod Sci 87:25-31. 2005
..A reduced ability to stimulate penile protrusion with RM precluded examination of the penis in a large proportion of bulls...
