Lamb, G.C.Cartmill, J.A.Hensley, B.A.El-Zarkouny, S.E.Marple, T.J.Stevenson, Jeffrey S.Grieger, David M.2010-08-232010-08-232010-08-23http://hdl.handle.net/2097/4681In two experiments, combining a source of progestin with the ovulation synchronization protocol using gonadotropin-releasing hormone plus prostaglandin F2a (GnRH + PGF2a) tended to increase or statistically increase pregnancy rates in suckled cows compared to GnRH + PGF2a alone. These improvements were accomplished without any detected estrus when cows were inseminated and received a second injection of GnRH at 48 hr after PGF2a.BeefCowsAIEstrus-Ovulation synchronizationGnRHPGF2aProgestinConference paper