Milk progesterone test and early pregnancy diagnosis in dairy cows
2011
Gvozdic, D., Faculty of Veterinary Medicine, Belgrade (Serbia) | Vukovic, D., PKB Corporation, Belgrade (Serbia) | Fratric, N., Faculty of Veterinary Medicine, Belgrade (Serbia) | Stancic, B., Faculty of Agriculture, Novi Sad (Serbia) | Bozic, A., Faculty of Agriculture, Novi Sad (Serbia) | Jovanovic, I., Faculty of Veterinary Medicine, Belgrade (Serbia) | Milanovic, S., Faculty of Veterinary Medicine, Belgrade (Serbia) | Barna, T., Scientific Veterinary Institute Novi Sad, Novi Sad (Serbia)
Early pregnancy diagnosis is powerful tool in the control of dairy cows reproduction. Milk progesterone concentration at 21-24 days after artificial insemination (AI) is one of the methods aiming for accurate and reliable early pregnancy diagnosis in dairy cattle. Total number of 25 dairy cows havebeen tested for milk progesterone concentration at estrus (AI), and 21 days after estrus and AI, using Ovucheck Milk test. Milk progesterone concentration iws at estrus and AI was 5.34 +/- 1.22 ng/mL (Mean +/- SD). At 21 days after estrus 19 cows have been diagnosed as pregnant, with milk progesterone concentration higher than 10 ng/mL. All cows have been examined at 35 days after AI by rectal palpation, and pregnancy diagnosis was confirmed at 10 dairy cows. Milk progesterone concentration in true pregnant cows at 21 days after estrus and AI was 16.84 +/- 3.29 ng/mL. Milk progesterone test was evaluated for early pregnancy diagnosis and test sensitivity, specificity, predictive value of positive and negative test results was 100%, 60%, 50% and 100%, respectively.
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