Animal Science Department

 

Date of this Version

2013

Citation

Published in 2013 Nebraska Beef Cattle Report.

Comments

Copyright © 2013 The Board of Regents of the University of Nebraska. Used by permission. All rights reserved.

Abstract

The objective of this experiment was to determine the effectiveness of fixed-time AI utilizing one of two estrus synchronization protocols, CO-Synch or CO-Synch + CIDR, in May-calving cows. Cows synchronized with the CO-Synch + CIDR protocol had increased AI and overall pregnancy rates compared to cows synchronized utilizing the CO-Synch protocol. Due to increased AI pregnancy rates, CO-Synch + CIDR cows calved earlier, resulting in a greater proportion of cows calving within the first 21 days of the calving season compared to CO-Synch cows.

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