Abstract
The ability of some reproduction synchronization protocols to increase conception rates (CR) is reported as being in part due to increased progesterone (P4) levels in the diestrus phase before breeding. This has been demonstrated mostly in an experimental context and was linked to GnRH increasing the proportion of cows luteinizing a second corpus luteum (CL). A pilottrial was conducted to determine if an injection of gonadorelin hydrochloride (Factrel®) or gonadorelin diacetate tetrahydrate (Cystorelin®) given 7 days after AI to all cows on a farm in field conditions resulted in a significant increase of P4 levels 14 days after AI, compared to a placebo. If an increase in P4 levels was to be observed, a second larger trial was to be conducted testing the effect of post-AI GnRH on CR at return to estrus.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: American Association of Bovine Practitioners Conference Proceedings
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
