Progesterone supplementation during the time of pregnancy recognition after artificial insemination improves conception rates in high-producing dairy cows

Theriogenology
I Garcia-IspiertoF López-Gatius

Abstract

This study examines the possible effects of progesterone (P4) supplementation during the time of pregnancy recognition, from Days 15 to 17 post-artificial insemination (AI), on reproductive performance in high-producing dairy cows. Cows in their 15th day post-AI were alternately assigned to a control, no-treatment group (C: n = 257) or treatment group (P4: n = 287) on a weekly rotational basis according to the chronologic order of their gynecologic visit. On the basis of the odds ratio, the interaction treatment × previous placenta retention had a significant effect (P = 0.02) on conception rate. Thus, cows in P4 that had not suffered a retained placenta were 1.6 times more likely to conceive 28 to 34 days post-AI than the remaining cows. In nonpregnant cows, treatment had no effect on subsequent return to estrus or AI interval and neither were any effects of treatment observed on twin pregnancy and early fetal loss rates. The results of this study demonstrate the efficacy of P4 supplementations during the time of pregnancy recognition after AI in cows without a clinical history of placenta retention.

References

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Jul 1, 1980·Journal of Reproduction and Fertility·J Lukaszewska, W Hansel
Sep 1, 1995·Prostaglandins, Leukotrienes, and Essential Fatty Acids·N L Poyser
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Feb 24, 2005·Theriogenology·F López-GatiusJ L Yániz
Nov 1, 2005·Theriogenology·F López-GatiusM López-Béjar
Nov 23, 2006·Theriogenology·I García-IspiertoM López-Béjar
Sep 1, 2010·Reproduction in Domestic Animals = Zuchthygiene·F López-Gatius, I García-Ispierto
Jul 21, 2015·Journal of Dairy Science·J H C CostaD M Weary

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