Definition and Risk Factors for an ovulation
Diagnosed at 50 Days in Milk in Dairy Cows
Volume 1 - Issue 3
Jocelyn Dubuc*
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- Université de Montréal, Rue Sicotte, Faculté de médecine vétérinaire, Saint-Hyacinthe, Québec, Canada
*Corresponding author:
Jocelyn Dubuc, Faculté de médecine vétérinaire, Université de Montréal, Rue Sicotte, Saint-Hyacinthe, Québec, Canada
Received: May 07, 2018; Published: May 21, 2018
DOI: 10.32474/CDVS.2018.01.000115
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Abstract
The objectives of this observational study were to determine the optimal progesteronemia threshold for defining an ovulation
at 50 days in milk (DIM) in dairy cows and to identify risk factors for this condition. A total of 3,776 cows from 100 Holstein dairy
herds were enrolled in this cow-level study. During farm visits, cows were bled at 1-14DIM to quantify ketonemia and glycemia,
examined at 30-43 DIM to diagnose purulent vaginal discharge, cytological endometritis, and leukocyte esterase endometritis,
and were bled at a 14d interval to quantify progesteronemia. Multiple progesteronemia thresholds were tested to identify the one
providing the highest sum of sensitivity and specificity to predict the pregnancy status at first service. The optimal threshold found
for defining an ovulation at 50DIM was ≤0.90 ng/mL. The final model for risk factors included parity group, season of calving,
cytological endometritis, hyperketonemia, hypoglycemia, and the two-way interaction term of hyperketonemia and hypoglycemia.
Overall, these results suggest that a progesteronemia threshold of ≤0.9ng/mL could be used to define an ovulation at 50 days in milk
in dairy cows.
Keywords: Dairy Cow; An ovulation; Postpartum Period; Risk Factor; Progesterone Concentrations; Metritis; Endometritis; Parity;
Season; Placenta
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