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Kansas Agricultural Experiment Station Research Reports
2004; Kansas Agricultural Experiment Station contribution; no. 04-242-S; Report of progress (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service); 923; Beef; Progestin estrus synchronization; CIDR vs. MGA; Insemination
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Short-Term Progestin Estrus Synchronization With Timed Insemination For Beef Heifers: Cidr Vs. Mga (2004), A.W. Thompson, D.R. Eborn, L.D. Keenan, David M. Grieger
Short-Term Progestin Estrus Synchronization With Timed Insemination For Beef Heifers: Cidr Vs. Mga (2004), A.W. Thompson, D.R. Eborn, L.D. Keenan, David M. Grieger
Kansas Agricultural Experiment Station Research Reports
Recently, a new product, Eazi-Breed CIDR (a vaginal insert containing progesterone), was approved for estrus synchronization in beef heifers. In previous studies the CIDR has produced excellent estrus synchrony, but it is more costly than the commonly used progestin, melengestrol acetate (MGA). Therefore, the objective of this study was to compare the CIDR to MGA in a shorter-term timed breeding program. Seventy-seven commercial beef replacement heifers were assigned to one of two treatments, CIDR (n=38) or MGA (n=39). Each heifer in the CIDR treatment group received a CIDR on day 1, which was removed on day 7. The MGA treatment …