Abstract
The 7-day CO-Synch + CIDR protocol is a popular ovulation-synchronization program used by cow-calf producers to facilitate artificial insemination (AI). A progesterone- impregnated controlled internal drug release (CIDR) insert is placed intravaginally and an injection of gonadotropin-releasing hormone (GnRH) is given. After 7 days, prostaglandin F2α(PGF2α) is administered and the CIDR insert is removed. Between 58 and 72 hours after insert removal, cows are inseminated after another injection of GnRH to induce ovulation. Timed AI pregnancy rates generally have ranged from 40 to 60% when suckled cows are treated with the 7-day CO-Synch + CIDR protocol.
Highlights
The 7-day CO-Synch + controlled internal drug release (CIDR) protocol is a popular ovulation-synchronization program used by cow-calf producers to facilitate artificial insemination (AI)
Pregnancy rates per AI were greater for cows that were cycling compared with noncycling cows (53.4% vs. 45.6%, respectively)
Cycling cows (n = 249) were 1.5 times (95% confidence intervals = 1.17 to 2.3) more (P=0.02) likely to become pregnant after the timed AI than noncycling cows (n = 335)
Summary
Recommended Citation Stevenson, Jeffrey S.; Pulley, Stephanie Leeann; Mellieon, H.I.; Olson, K. C.; Johnson, Sandra K.; Grieger, David M.; Jaeger, John R.; and Breiner, Ryan M. (2011) "Optimizing a new 5-day CIDR-CO-Synch timed artificial insemination program," Kansas Agricultural Experiment Station Research Reports: Vol 0: Iss. 1.
Sign-in/Register to view highlights & summary 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: Kansas Agricultural Experiment Station Research Reports
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.
