Page Banner

United States Department of Agriculture

Agricultural Research Service

Title: Estrus Synchronization of Suckled Beef Cows by Using Gnrh, Prostaglandin F2¿ (Pgf), and Progesterone (Cidr): a Multi-Location Study.

Authors
item Larson, J - U OF MINNESOTA, GRAND RAP
item Lamb, G - U OF MINNESOTA, GRAND RAP
item Stevenson, J - OHIO STATE U, COLUMBUS
item Marston, T - OHIO STATE U, COLUMBUS
item Johnson, S - OHIO STATE U, COLUMBUS
item Day, M - OHIO STATE U, COLUMBUS
item Geary, Thomas
item Kesler, D - U OF ILLINOIS, CHAMPAIGN
item Dejarnette, J - SELECT SIRES, INC. OHIO
item Schrick, F - U OF TENNESSEE,KNOXVILLE

Submitted to: Workshop Proceedings
Publication Type: Proceedings
Publication Acceptance Date: June 7, 2004
Publication Date: July 1, 2004
Citation: Larson, J.E., Lamb, G.C., Stevenson, J.S., Marston, T.W., Johnson, S.K., Day, M.L., Geary, T.W., Kesler, D.J., Dejarnette, J.M., Schrick, F.N. 2004. Estrus synchronization of suckled beef cows by using gnrh, prostaglandin f2¿ (pgf), and progesterone (cidr): a multi-location study.. Workshop Proceedings. Cattlemen's Day 2004. pg. 7-10.

Interpretive Summary: Estrus was synchronized in 2,630 suckled beef cows from 14 locations with one of five treatments using CIDRs, GnRH, and PGF with breeding by estrus and/or timed AI (TAI) only. The protocols used are described in the technical abstract. The addition of a GnRH injection at CIDR insertion increased pregnancy rates of cows. The CO-Synch protocol with only TAI resulted in the poorest pregnancy rates, and pregnancy rates greater than 50% at 9 of 14 locations. Addition of TAI with GnRH following an 84 h period of breeding by estrus increased pregnancy rates, and use of a TAI protocol alone would yield greater pregnancy rates than protocols involving only a short period of estrus detection with AI. The protocol that most consistently yielded the greatest pregnancy rates was the Hybrid Synch + CIDR protocol, with pregnancy rates greater than 50% at 10 of 14 locations.

Technical Abstract:

Last Modified: 7/24/2014
Footer Content Back to Top of Page