Evaluation of a Modified Heatsynch Estrus Synchronization Program on a California Commercial Dairy

Authors

  • A. P. Bos Almond Valley Veterinary Clinic, Escalon, California
  • A. P. Belschner Pharmacia Animal Health, Kalamazoo, Michigan
  • N. Michael ABS Global DeForest, Wisconsin

DOI:

https://doi.org/10.21423/aabppro20025047

Keywords:

breeding systems, timed artificial insemination, gonadotropin-releasing hormone, GnRH, estradiol cypionate, prostaglandin F-2 alpha, progesterone test, heat detection program, bull-bred string

Abstract

This study compares the number of pregnant animals by 120 days after calving using three different breeding systems. The breeding programs include an aggressive, timed artificial insemination (AI) program that incorporates treatment with gonadotropin-releasing hormone (GnRH), estradiol cypionate (ECP), prostaglandin F-2 alpha (PGF2a) and a 20-day post-breeding progesterone test; a prostaglandin-based heat detection program; and a bull-bred string.

Cover image of the 35th Conference Proceedings: Holstein cows standing in a row at a fence. A small group of cattle are bunched together in a pen. Yellow background.

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Published

2002-09-26

Issue

2002

Section

Research Summaries - Dairy I