Supplemental progestin increases pregnancy rates in suckled beef cows

Authors

G.C. Lamb
J.A. Cartmill
B.A. Hensley
S.E. El-Zarkouny
T.J. Marple
Jeffrey S. Stevenson
David M. Grieger

Keywords

Cattlemen's Day, 2000; Kansas Agricultural Experiment Station contribution; no. 00-287-S; Report of progress (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service); 850; Beef; Cows; AI; Estrus-Ovulation synchronization; GnRH; PGF2α; Progestin

Abstract

In two experiments, combining a source of progestin with the ovulation synchronization protocol using gonadotropin-releasing hormone plus prostaglandin F2α (GnRH + PGF2α) tended to increase or statistically increase pregnancy rates in suckled cows compared to GnRH + PGF2α alone. These improvements were accomplished without any detected estrus when cows were inseminated and received a second injection of GnRH at 48 hr after PGF2α.

Recommended Citation

Lamb, G.C.; Cartmill, J.A.; Hensley, B.A.; El-Zarkouny, S.E.; Marple, T.J.; Stevenson, Jeffrey S.; and Grieger, David M. (2000) "Supplemental progestin increases pregnancy rates in suckled beef cows," Kansas Agricultural Experiment Station Research Reports: Vol. 0: Iss. 1. https://doi.org/10.4148/2378-5977.1814