T Duffield

Summary

Affiliation: University of Guelph
Country: Canada

Publications

  1. doi request reprint Impact of hyperketonemia in early lactation dairy cows on health and production
    T F Duffield
    Department of Population Medicine, Ontario Veterinary College, University of Guelph, Guelph, Ontario, Canada
    J Dairy Sci 92:571-80. 2009
  2. ncbi request reprint Subclinical ketosis in lactating dairy cattle
    T Duffield
    Department of Population Medicine, Ontario Veterinary College, University of Guelph, Canada
    Vet Clin North Am Food Anim Pract 16:231-53, v. 2000
  3. doi request reprint Overview of meta-analysis of monensin in dairy cattle
    Todd F Duffield
    Department of Population Medicine, Ontario Veterinary College, University of Guelph, Guelph, ON, Canada N1G 2W1
    Vet Clin North Am Food Anim Pract 28:107-19, ix. 2012
  4. pmc Reduction in pain response by combined use of local lidocaine anesthesia and systemic ketoprofen in dairy calves dehorned by heat cauterization
    Todd F Duffield
    Department of Population Medicine, Ontario Veterinary College, University of Guelph, Guelph, Ontario N1G 2W1
    Can Vet J 51:283-8. 2010
  5. doi request reprint Research and teaching of dairy cattle well being: finding synergy between ethology and epidemiology
    Todd F Duffield
    Department of Population Medicine, Ontario Veterinary College, University of Guelph, Guelph, Ontario, Canada
    J Appl Anim Welf Sci 12:132-42. 2009
  6. doi request reprint A meta-analysis of the impact of monensin in lactating dairy cattle. Part 2. Production effects
    T F Duffield
    Department of Population Medicine, University of Guelph, Guelph, Ontario, N1G 2W1, Canada
    J Dairy Sci 91:1347-60. 2008
  7. doi request reprint A meta-analysis of the impact of monensin in lactating dairy cattle. Part 1. Metabolic effects
    T F Duffield
    Department of Population Medicine, University of Guelph, Guelph, Ontario, N1G 2W1 Canada
    J Dairy Sci 91:1334-46. 2008
  8. doi request reprint A meta-analysis of the impact of monensin in lactating dairy cattle. Part 3. Health and reproduction
    T F Duffield
    Department of Population Medicine, University of Guelph, Guelph, Ontario, Canada N1G 2W1
    J Dairy Sci 91:2328-41. 2008
  9. ncbi request reprint Comparison of techniques for measurement of rumen pH in lactating dairy cows
    T Duffield
    Department of Population Medicine, University of Guelph, Guelph, Ontario N1G 2W1
    J Dairy Sci 87:59-66. 2004
  10. ncbi request reprint A field study of dietary interactions with monensin on milk fat percentage in lactating dairy cattle
    T Duffield
    Department of Population Medicine, Ontario Veterinary College, University of Guelph, Guelph, Ontario, Canada, N1G 2W1
    J Dairy Sci 86:4161-6. 2003

Collaborators

Detail Information

Publications47

  1. doi request reprint Impact of hyperketonemia in early lactation dairy cows on health and production
    T F Duffield
    Department of Population Medicine, Ontario Veterinary College, University of Guelph, Guelph, Ontario, Canada
    J Dairy Sci 92:571-80. 2009
    ..Hyperketonemia can be defined at 1,400 micromol/L of BHBA and in the first 2 wk postpartum increases disease risk and results in substantial loss of milk yield in early lactation...
  2. ncbi request reprint Subclinical ketosis in lactating dairy cattle
    T Duffield
    Department of Population Medicine, Ontario Veterinary College, University of Guelph, Canada
    Vet Clin North Am Food Anim Pract 16:231-53, v. 2000
    ..All currently available cowside tests for subclinical ketosis have certain limitations in their use. Effective monitoring schemes for subclinical ketosis can be developed, however, and these may be useful in many herd health programs...
  3. doi request reprint Overview of meta-analysis of monensin in dairy cattle
    Todd F Duffield
    Department of Population Medicine, Ontario Veterinary College, University of Guelph, Guelph, ON, Canada N1G 2W1
    Vet Clin North Am Food Anim Pract 28:107-19, ix. 2012
    ..Its importance and utility will continue to grow in future years...
  4. pmc Reduction in pain response by combined use of local lidocaine anesthesia and systemic ketoprofen in dairy calves dehorned by heat cauterization
    Todd F Duffield
    Department of Population Medicine, Ontario Veterinary College, University of Guelph, Guelph, Ontario N1G 2W1
    Can Vet J 51:283-8. 2010
    ..05), and tended to consume more starter (P = 0.09) than control calves. Ketoprofen is effective for mitigating behavioral effects of postsurgical pain following dehorning in 4- to 8-week-old calves...
  5. doi request reprint Research and teaching of dairy cattle well being: finding synergy between ethology and epidemiology
    Todd F Duffield
    Department of Population Medicine, Ontario Veterinary College, University of Guelph, Guelph, Ontario, Canada
    J Appl Anim Welf Sci 12:132-42. 2009
    ..The paper provides the basis and context for the synergy between ethology and epidemiology and describes examples of teaching and research programs built upon this synergy for the enhancement of dairy cattle well being...
  6. doi request reprint A meta-analysis of the impact of monensin in lactating dairy cattle. Part 2. Production effects
    T F Duffield
    Department of Population Medicine, University of Guelph, Guelph, Ontario, N1G 2W1, Canada
    J Dairy Sci 91:1347-60. 2008
    ..These findings indicate a benefit of monensin for improving milk production efficiency while maintaining body condition. The effect of monensin on milk fat percentage and yield was influenced by diet...
  7. doi request reprint A meta-analysis of the impact of monensin in lactating dairy cattle. Part 1. Metabolic effects
    T F Duffield
    Department of Population Medicine, University of Guelph, Guelph, Ontario, N1G 2W1 Canada
    J Dairy Sci 91:1334-46. 2008
    ..254). Monensin had less impact on serum glucose in the pre-calving time period (coefficient -0.237). These findings demonstrate an improvement in the energy metabolism of dairy cows supplemented with monensin...
  8. doi request reprint A meta-analysis of the impact of monensin in lactating dairy cattle. Part 3. Health and reproduction
    T F Duffield
    Department of Population Medicine, University of Guelph, Guelph, Ontario, Canada N1G 2W1
    J Dairy Sci 91:2328-41. 2008
    ..Improvements in ketosis, displaced abomasums, and mastitis with monensin were achieved. Exposure to prolonged treatment in the dry period with monensin may increase the risk of dystocia and retained placenta...
  9. ncbi request reprint Comparison of techniques for measurement of rumen pH in lactating dairy cows
    T Duffield
    Department of Population Medicine, University of Guelph, Guelph, Ontario N1G 2W1
    J Dairy Sci 87:59-66. 2004
    ..The most accurate field technique was rumenocentesis. Improved field techniques are required for better on-farm diagnosis of subacute rumen acidosis...
  10. ncbi request reprint A field study of dietary interactions with monensin on milk fat percentage in lactating dairy cattle
    T Duffield
    Department of Population Medicine, Ontario Veterinary College, University of Guelph, Guelph, Ontario, Canada, N1G 2W1
    J Dairy Sci 86:4161-6. 2003
    ..2%) but not in those receiving diets high in NSC (> or = 40.2%). The results of this study suggest that there are significant interactions between monensin and certain dietary factors on milk fat suppression in Holstein dairy herds...
  11. ncbi request reprint Prepartum monensin for the reduction of energy associated disease in postpartum dairy cows
    T Duffield
    Department of Population Medicine, University of Guelph, Ontario
    J Dairy Sci 85:397-405. 2002
    ..The monensin controlled release capsule reduced the incidence of energy associated disease by 30%...
  12. ncbi request reprint Effect of a monensin controlled release capsule on metabolic parameters in transition dairy cows
    T F Duffield
    Department of Population Medicine, University of Guelph, Guelph, Ontario N1G 2W1
    J Dairy Sci 86:1171-6. 2003
    ..Improvement of energy balance before calving is important for the prevention of energy associated metabolic diseases, such as retained placenta, clinical ketosis, and displaced abomasum, which might occur immediately postcalving...
  13. ncbi request reprint Metabolic aspects in the etiology of displaced abomasum
    T Geishauser
    Department of Population Medicine, Ontario Veterinary College, University of Guelph, Canada
    Vet Clin North Am Food Anim Pract 16:255-65, vi. 2000
    ..Prevention of subclinical ketosis may prevent DA...
  14. doi request reprint Isolation of bovine intestinal Lactobacillus plantarum and Pediococcus acidilactici with inhibitory activity against Escherichia coli O157 and F5
    A Rodriguez-Palacios
    Department of Clinical Studies, University of Guelph, Guelph, Ontario, Canada
    J Appl Microbiol 106:393-401. 2009
    ....
  15. ncbi request reprint Short communication: Effects of subacute ruminal acidosis on free-choice intake of sodium bicarbonate in lactating dairy cows
    J E Keunen
    Department of Animal and Poultry Science, University of Guelph, Guelph, ON, N1G 2W1, Canada
    J Dairy Sci 86:954-7. 2003
    ..These low SB intakes must not have substantially affected rumen pH. Sodium bicarbonate intake differed significantly (P < 0.05) between cows. These data indicate that cows did not select SB in order to attenuate SARA...
  16. ncbi request reprint Effects of prepartum administration of a monensin controlled release capsule on rumen pH, feed intake, and milk production of transition dairy cows
    A M Fairfield
    Department of Animal and Poultry Science, University of Guelph, Guelph, Ontario, Canada N1G 2W1
    J Dairy Sci 90:937-45. 2007
    ..Results suggest that prepartum administration of a monensin CRC did not increase rumen pH in multiparous cows fed the experimental diets during the transition period and early lactation...
  17. ncbi request reprint Prevalence and risk factors for postpartum anovulatory condition in dairy cows
    R B Walsh
    Department of Population Medicine, University of Guelph, Guelph, Ontario, Canada, N1G 2W1
    J Dairy Sci 90:315-24. 2007
    ..The daily probability of pregnancy (hazard ratio) was similar to cycling cows by 165 d in milk. The results underline the important associations of peripartum health with reproductive function and performance...
  18. ncbi request reprint Technical note: A system for continuous recording of ruminal pH in cattle
    O Alzahal
    Department of Animal and Poultry Science, University of Guelph, Guelph, Ontario, Canada N1G 2W1
    J Anim Sci 85:213-7. 2007
    ..04) was greater (P = 0.009) than that of the continuous system (6.56 +/- 0.03), with a correlation of r = 0.88 (P = 0.002). The continuous recording system has the potential to facilitate measurement of ruminal pH in free-roaming cattle...
  19. ncbi request reprint The effect of a progesterone releasing intravaginal device (PRID) on pregnancy risk to fixed-time insemination following diagnosis of non-pregnancy in dairy cows
    R B Walsh
    Department of Population Medicine, University of Guelph, Guelph, Ontario, Canada N1G 2W1
    Theriogenology 67:948-56. 2007
    ..8% versus 34.9% in PRID-treated versus PID-treated animals. Exogenous progesterone provided through an intravaginal device to non-pregnant cows that had not displayed estrus improved the probability of pregnancy after fixed-time AI...
  20. ncbi request reprint Effects of rumen-protected choline and monensin on milk production and metabolism of periparturient dairy cows
    L C Zahra
    Department of Population Medicine, University of Guelph, Guelph, Ontario, Canada N1G 2W1
    J Dairy Sci 89:4808-18. 2006
    ..The metabolic effects of CRC are consistent with previous studies, and the effects on liver are novel. The mechanism by which RPC increased milk production was not revealed in this study and merits further research...
  21. ncbi request reprint Adherence and efficacy of an external teat sealant to prevent new intramammary infections in the dry period
    G H Lim
    Department of Population Medicine, Ontario Veterinary College, Guelph, Ontario, Canada N1G 2W1
    J Dairy Sci 90:1289-300. 2007
    ..Double sealant application, cooler seasons, and longer teat lengths were associated with a significant increase in the duration of sealant adherence to the teat-end...
  22. ncbi request reprint Effect of monensin delivery method on dry matter intake, body condition score, and metabolic parameters in transition dairy cows
    C S Petersson-Wolfe
    Department of Population Medicine, University of Guelph, Guelph, Ontario, N1G 2W1
    J Dairy Sci 90:1870-9. 2007
    ..Serum concentrations of all measured metabolic parameters varied over the peripartum period. Calving season, parity, and body condition score at the start of the study period influenced many of the measured metabolic parameters...
  23. ncbi request reprint Effect of isoflupredone acetate with or without insulin on energy metabolism, reproduction, milk production, and health in dairy cows in early lactation
    H A Seifi
    Department of Clinical Sciences, School of Veterinary Medicine, Ferdowsi University of Mashhad, PO Box 91775 1793, Mashhad, Iran
    J Dairy Sci 90:4181-91. 2007
    ..There were no treatment effects on test-day milk production, milk fat and protein percentages, or the intervals from calving to first insemination or pregnancy...
  24. doi request reprint Effects of monensin and dietary soybean oil on milk fat percentage and milk fatty acid profile in lactating dairy cows
    O Alzahal
    University of Guelph, Guelph, Ontario, N1G 2W1 Canada
    J Dairy Sci 91:1166-74. 2008
    ..Soybean oil reduced total saturated FA and increased total monounsaturated FA. These results suggest that monensin reduces milk fat percentage and this effect is accentuated when SBO is added to the ration...
  25. ncbi request reprint The effect of treatment of clinical endometritis on reproductive performance in dairy cows
    S J LeBlanc
    Department of Population Medicine, University of Guelph, Ontario, Canada N1G 2W1
    J Dairy Sci 85:2237-49. 2002
    ..u. and with PGF2 alpha was not statistically significant. Treatment of postpartum endometritis should be reserved for cases diagnosed after 26 DIM, based on criteria that are associated with subsequent pregnancy rate...
  26. ncbi request reprint Defining and diagnosing postpartum clinical endometritis and its impact on reproductive performance in dairy cows
    S J LeBlanc
    Department of Population Medicine, University of Guelph, Guelph, Ontario, Canada N1G 2W1
    J Dairy Sci 85:2223-36. 2002
    ..73 for pregnancy (took 27% longer to become pregnant), and were 1.7 times more likely to be culled for reproductive failure than cows without endometritis...
  27. ncbi request reprint The effect of a single administration of cephapirin or cloprostenol on the reproductive performance of dairy cows with subclinical endometritis
    R Kasimanickam
    Department of Population Medicine, University of Guelph, Guelph, Ont, N1G 2W1, Canada
    Theriogenology 63:818-30. 2005
    ..89 (P = 0.01) and 1.70 (P = 0.05), respectively]. In conclusion, a single treatment with cephapirin or cloprostenol at 20-33 DIM significantly improved the reproductive performance of cows with subclinical endometritis...
  28. ncbi request reprint Effects of rumen acid load from feed and forage particle size on ruminal pH and dry matter intake in the lactating dairy cow
    B Rustomo
    Department of Animal and Poultry Science, University of Guelph, Guelph, Ontario, Canada N1G 2W1
    J Dairy Sci 89:4758-68. 2006
    ..The AV approach combined with physically effective neutral detergent fiber would therefore improve the formulation of diets and help to mitigate subacute ruminal acidosis in dairy cows...
  29. ncbi request reprint Major advances in disease prevention in dairy cattle
    S J LeBlanc
    Population Medicine, Ontario Veterinary College, University of Guelph, Ontario, N1G 2W1, Canada
    J Dairy Sci 89:1267-79. 2006
    ....
  30. ncbi request reprint The efficacy of intramammary tilmicosin at drying-off, and other risk factors for the prevention of new intramammary infections during the dry period
    R T Dingwell
    University of Guelph, Guelph, Ontario N1G 2W1, Canada
    J Dairy Sci 85:3250-9. 2002
    ..Use of blanket dry cow antibiotic therapy compared to selective dry cow therapy, as well as the importance of identifying risk factors and managing the environment of dry cows are discussed...
  31. ncbi request reprint Ovarian follicular activity in lactating Holstein cows supplemented with monensin
    S K Tallam
    Department of Animal and Poultry Science, University of Guelph, Guelph, ON, Canada N1G 2W1
    J Dairy Sci 86:3498-507. 2003
    ..Supplementation with monensin resulted in a shorter postpartum interval to first ovulation but did not affect other reproductive measures in healthy, lactating dairy cows...
  32. ncbi request reprint Short communication: Effects of a monensin premix on milk fatty acid content during subacute ruminal acidosis in dairy cows
    T Mutsvangwa
    Department of Animal and Poultry Science, University of Guelph, Guelph, ON, Canada N1G 2W1
    J Dairy Sci 86:4043-6. 2003
    ..Results from this study indicate that dietary supplementation with monensin during SARA had little effect on milk fatty acid content...
  33. ncbi request reprint Efficacy of intramammary tilmicosin and risk factors for cure of Staphylococcus aureus infection in the dry period
    R T Dingwell
    University of Guelph, Guelph, Ontario N1G 2W1, Canada
    J Dairy Sci 86:159-68. 2003
    ..Results of this study demonstrate that intramammary tilmicosin at drying-off is efficacious in curing existing S. aureus during the dry period. Risk factors associated with the cure of S. aureus were identified...
  34. ncbi request reprint Effects of a monensin controlled-release capsule or premix on attenuation of subacute ruminal acidosis in dairy cows
    T Mutsvangwa
    Department of Animal and Poultry Science, University of Guelph, Guelph, ON, Canada N1G 2W1
    J Dairy Sci 85:3454-61. 2002
    ..In conclusion, there is no evidence that monensin was efficacious in raising ruminal pH during SARA under the conditions employed in this study...
  35. ncbi request reprint Association of cow and quarter-level factors at drying-off with new intramammary infections during the dry period
    R T Dingwell
    University of Guelph, Guelph, Ont, Canada N1G 2W1
    Prev Vet Med 63:75-89. 2004
    ..After 6 dry weeks, 23% of quarters were still open. The hazard of quarters closing if milk production on the day prior to drying-off was >21 kg 1.8-times less...
  36. ncbi request reprint Endometrial cytology and ultrasonography for the detection of subclinical endometritis in postpartum dairy cows
    R Kasimanickam
    Department of Population Medicine, University of Guelph, Guelph, Ontario, Canada N1G 2W1
    Theriogenology 62:9-23. 2004
    ..In conclusion, subclinical endometritis, diagnosed by EC or US, was associated with reduced relative pregnancy rate...
  37. ncbi request reprint Peripartum serum vitamin E, retinol, and beta-carotene in dairy cattle and their associations with disease
    S J LeBlanc
    Department of Population Medicine, University of Guelph, Ontario, Canada N1G 2W1
    J Dairy Sci 87:609-19. 2004
    ..There were significant positive associations of peripartum serum concentrations among each of alpha-tocopherol, beta-carotene, and retinol...
  38. ncbi request reprint The effects of subacute ruminal acidosis on sodium bicarbonate-supplemented water intake for lactating dairy cows
    G Cottee
    Department of Animal and Poultry Science, University of Guelph, Guelph, Ontario, Canada N1G 2W1
    J Dairy Sci 87:2248-53. 2004
    ..During the period of day with the most severe ruminal pH depression, the lactating dairy cows subjected to SARA increased their total water intake...
  39. ncbi request reprint Effects of monensin on ruminal forage degradability and total tract diet digestibility in lactating dairy cows during grain-induced subacute ruminal acidosis
    J K Osborne
    Department of Animal and Poultry Science, University of Guelph, Guelph, ON, Canada N1G 2W1
    J Dairy Sci 87:1840-7. 2004
    ..This study indicates that monensin altered total tract nutrient digestion by increasing fiber digestion at postruminal sites...
  40. ncbi request reprint Genetic susceptibility to Neospora caninum infection in Holstein cattle in Ontario
    Y Pan
    CGIL, Department of Animal and Poultry Science, University of Guelph, Ontario, Canada N1G 2W1
    J Dairy Sci 87:3967-75. 2004
    ..To reduce the incidence of N. caninum infection, more emphasis should be placed on management practices than on genetic selection...
  41. ncbi request reprint Metabolic predictors of displaced abomasum in dairy cattle
    S J LeBlanc
    Department of Population Medicine, University of Guelph, Ontario, N1G 2W1, Canada
    J Dairy Sci 88:159-70. 2005
    ..Serum calcium concentration was not associated with LDA. Strategic use of metabolic tests to monitor transition dairy cows should focus on NEFA in the last week prepartum and BHBA in the first week postpartum...
  42. ncbi request reprint The association of herd milk production and management with a return-over-feed index in Ontario dairy herds
    C J McLaren
    Department of Population Medicine, University of Guelph, Guelph, Ontario, N1G 2W1, Canada
    J Dairy Sci 88:419-25. 2005
    ..59/d per cow higher ROF. Production-related variables accounted for more variation in the ROF index than management variables, and the latter, e.g., use of monensin, only marginally increased R2 of production-based regression models...
  43. ncbi request reprint Effects of a subacute ruminal acidosis model on the diet selection of dairy cows
    J E Keunen
    Department of Animal and Poultry Science, University of Guelph, Guelph, Ontario, Canada N1G2W1
    J Dairy Sci 85:3304-13. 2002
    ..23 +/- 0.03 units lower, and time below pH 6.0 and 5.6 was higher compared to control. These results suggest that when given a choice of feeds, dairy cows alter their diet selection to attempt to attenuate SARA...
  44. ncbi request reprint Risk factors associated with Neospora caninum abortion in Ontario Holstein dairy herds
    J C Hobson
    Department of Population Medicine, Ontario Veterinary College, University of Guelph, Guelph, Ont, Canada N1G 2W1
    Vet Parasitol 127:177-88. 2005
    ..4 and OR = 0.7, respectively) and the housing of heifers on loafing packs (a housing pen divided into feed manger, scrape alley and bedded pack areas, OR = 0.1)...
  45. ncbi request reprint Effects of monensin and stage of lactation on variation of blood metabolites within twenty-four hours in dairy cows
    J C Plaizier
    Department of Animal Science, University of Manitoba, Winnipeg, R3T 2N2, Canada
    J Dairy Sci 88:3595-602. 2005
    ..Urea was higher at wk 6 compared with wk -1. The variation within 24 h of glucose, BHBA, and NEFA were not affected by monensin and stage of lactation. Diurnal variation of urea was affected by stage of lactation, but not by monensin...
  46. ncbi request reprint Effects of mild heat stress and grain challenge on acid-base balance and rumen tissue histology in lambs
    N E Odongo
    Department of Animal and Poultry Science, University of Guelph, Ontario, N1G 2W1, Canada
    J Anim Sci 84:447-55. 2006
    ..3 vs. 1.5; P < 0.05). These results suggest that under HS the acidifying effects of GC on acid-base balance in lambs were counteracted in the short-term through respiratory adaptation...
  47. ncbi request reprint The effect of subclinical ketosis in early lactation on reproductive performance of postpartum dairy cows
    R B Walsh
    Department of Population Medicine, University of Guelph, Ontario, Canada, N1G 2W1
    J Dairy Sci 90:2788-96. 2007
    ..From this analysis, both the relative circulating concentration of BHBA and the duration of elevated circulating BHBA were negatively associated with the probability of pregnancy at first service...