科研之友
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摘要
Protocols for synchronization of ovulation are widely adopted by the dairy industry to improve reproductive efficiency. It was the objective of this article to summarize three studies recently published that present valuable information for dairy practitioners. In the first study from Bisinotto et al. (2015) targeted progesterone supplementation in dairy cows without a corpus luteum at the beginning of an Ovsynch protocol was evaluated. Cows without a corpus luteum received two progesterone devices intravaginal for seven days. This treatment led to a recovery of fertility. The second study (Fricke et al., 2014) compared two different management strategies for submission of cows to first postpartum artificial insemination (AI). A Presynch-Ovsynch protocol was combined with an automated activity monitoring system. In one group cows received 100 % timed AI. In the other group cows were either inseminated with increased activity or timed AL Pregnancy per AI was higher when cows received only timed AI. However, time to first AI was improved in the second group with estrus detection. The third study (Dirandeh et al., 2015) evaluated three different synchronization protocols for dairy cows under heat stress. Compared to a Presynch-Ovsynch protocol with or without GnRH application the Double-Ovsynch protocol had the highest pregnancy per AI.
- 出版日期2015-11-1
