Modification of a CIDR/OvSynch Timed Artificial Insemination Protocol for Reproductive Management of Dairy Heifers

Authors

  • M. B. Rabaglino Department of Large Animal Clinical Sciences, University of Florida, Gainesville, Florida 32610
  • C. A. Risco Department of Large Animal Clinical Sciences, University of Florida, Gainesville, Florida 32610
  • N. Francisco Alliance Dairy, Chiefland, Florida
  • I. H. Kim Department of Animal Sciences, University of Florida, Gainesville, Florida 32610
  • M. J. Thatcher Department of Large Animal Clinical Sciences, University of Florida, Gainesville, Florida 32610
  • W. W. Thatcher Department of Animal Sciences, University of Florida, Gainesville, Florida 32610

DOI:

https://doi.org/10.21423/aabppro20084412

Keywords:

pregnancy rates, timed AI, reproductive management, resynchronization, estrus detection

Abstract

Acceptable pregnancy rates (PR) after timed AI (TAI) could improve reproductive management of dairy heifers. In beef cattle (Helser, 2006) the CIDR/OvSynch TAI protocol was improved by reducing the interval between GnRH and PGF to five days, giving two injections (AM/PM) of PG F and administering GnRH and TAI at 72 h after withdrawal of the CIDR to increase the proestrus period. The overall PR was 65.3%. Using this procedure in dairy heifers, PR was 58.3% at day 32 post TAI (Thatcher, 2007). Objectives of Exp. 1 were to compare PR of dairy heifers relative to whether one vs. two injections of PGF is required for effective use of the CIDR/OvSynch TAI protocol, and to compare PRs to CIDR/OvSynch TAI resynchronization programs of non-pregnant heifers involving estrus and no estrus detection. A second objective was to evaluate PR in two additional groups of heifers using the CIDR/OvSynchTAI protocol with one injection of PGF for first and second service without estrus detection (Exp. 2).

Cover image of the 41st Conference Proceedings: A herd of cattle standing in the field, framed by a cloudy sky. Yellow background.

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Published

2008-09-25

Issue

2008

Section

Research Summaries

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