Utilization of a 5- or 14-day progestin-based estrous synchronization protocol with sorted semen in beef heifers

Authors

  • J. G. Powell Department of Animal Science, University of Arkansas, Fayetteville, AR 72701
  • T. D. Lester Department of Animal Science, University of Arkansas, Fayetteville, AR 72701
  • J. L. Reynolds Department of Animal Science, University of Arkansas, Fayetteville, AR 72701
  • A. J. Davis Department of Animal Science, University of Arkansas, Fayetteville, AR 72701
  • J. A. Hornsby Department of Animal Science, University of Arkansas, Fayetteville, AR 72701
  • R. W. Rorie Department of Animal Science, University of Arkansas, Fayetteville, AR 72701

DOI:

https://doi.org/10.21423/aabppro20123954

Keywords:

estrous synchronization, controlled internal drug-release insert, gonadotropin releasing hormone, prostaglandin, sorted semen

Abstract

Estrous synchronization protocols that utilize progestin via a controlled internal drug-release insert (CIDR) in conjunction with gonadotropin releasing hormone (GnRH) and prostaglandin (PG) treatments have been shown to be effective in beef heifers. Sorted semen is more costly than unsorted semen; thus, AI pregnancy rates need to be maximized when sorted semen is used. The objective of this study was to compare the effectiveness of a 5-day versus a 14-day CIDR protocol when sorted semen is utilized for AI in beef heifers. A secondary objective was to determine the effect of timing of insemination on pregnancy rates when using sorted semen.

Cover image of the 45th Conference Proceedings: Three black-and-white cows lounge in a spring field. Yellow background.

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Published

2012-09-20

Issue

2012

Section

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