Comparison of Long-Term Progestin-Based Estrous Synchronization Protocols in Beef Cows and Heifers

Authors

  • J. G. Powell Department of Animal Science, University of Arkansas, Fayetteville, AM 72701
  • T. D. Lester Department of Animal Science, University of Arkansas, Fayetteville, AM 72701
  • M. P. Rowe Department of Animal Science, University of Arkansas, Fayetteville, AM 72701
  • C. L. Williams Department of Animal Science, University of Arkansas, Fayetteville, AM 72701
  • R. W. Rorie Department of Animal Science, University of Arkansas, Fayetteville, AM 72701

DOI:

https://doi.org/10.21423/aabppro20114057

Keywords:

exogenous progestins, Synchronization, gonadotropin releasing hormone, GnRH, prostaglandin, artificial insemination, melengestrol acetate, CIDR

Abstract

Synchronization protocols utilizing a 14-day pre-treatment with exogenous progestins prior to gonadotropin releasing hormone (GnRH), and prostaglandin (PG) treatments have been shown to be effective for estrous synchronization in beef cows and heifers. However, beef producers are reluctant to incorporate estrous synchronization and artificial insemination (AI) into their operations. This may be due to the time and labor required for these procedures. Although effective, the progestin-select synch protocol described above can require 33 days to complete. Previous studies in our lab indicate that reducing the time between progestin (CIDR) removal and GnRH dosing from 12 to two days shortens the protocol by 10 days without loss of effectiveness. The objective of our current experiment was to compare the effectiveness of melengestrol acetate (MGA) with CIDR progesterone inserts in an estrous synchronization protocol, where the interval from progestin removal to GnRH dosing was two days.

Cover image of the 44th Conference Proceedings: photo of the skyline of St. Louis, Missouri, site of the 2011 AABP Conference. Yellow background.

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Published

2011-09-22

Issue

2011

Section

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