Bull Exposure, When Combined With a Seven-day MGA Synchronization, Does Not Enhance Conception Rates in Cows

Authors

Michelle M. Baltes, University of Nebraska-Lincoln
Rebecca C. Bott, University of Nebraska-Lincoln
Ryann McFee, University of Nebraska-Lincoln
Joseph S. Schulz, University of Nebraska-Lincoln
Candice F. Toombs, University of Nebraska-Lincoln
Jeffrey W. Bergman, University of Nebraska-LincolnFollow
Karl V. Moline, University of Nebraska-LincolnFollow
Andrea S. Cupp, University of Nebraska-LincolnFollow

Date of this Version

January 2006

Comments

Published in 2006 Nebraska Beef Cattle Report. Copyright © 2005 The Board of Regents of the University of Nebraska.

Abstract

The purpose of the current experiments was to determine if cows exposed to sterile bulls (epididyectomized) in combination with a 7-day MGA treatment would have an advantage in conception rates to cows not exposed to bulls. Bull exposure increased percentage of cows cycling prior to synchronization and reduced the time from calving to initiation of cycling. Overall there was not an increase in conception rates to timed TAI or in total pregnancy rates in bull exposed MGA treated cows when compared to cows not exposed to bulls.