Estrous Synchronization in Cattle

Estrus synchronization is a reproductive management tool that is particularly useful in artificial insemination (AI) and embryo transfer (ET) programs. The estrous cycle is manipulated with one or more hormones, depending on the protocol, to bring females into estrus (heat) at a similar time of the producer’s choosing. Therefore, estrus synchronization makes the breeding of females enrolled in AI and ET programs convenient for busy producers.

Estrus synchronization with natural or artificial breeding offers several benefits. A synchronized herd results in a larger proportion of calves on the ground earlier in the calving season; these animals will then be older and heavier at weaning and will have enhanced carcass values. These calves will also be more uniform in age and size at weaning, which is beneficial for marketing purposes. When combined with AI and the use of semen from superior sires, the calf crop also has the potential for improved genetics.

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Publication 2614 (POD-04-26)

Revised by Ashleigh Muth-Spurlock, former Graduate Research Assistant, and Brandi Karisch, PhD, Associate Extension/Research Professor, Animal and Dairy Sciences, from a previous edition by Jane A. Parish, PhD, Jamie E. Larson, PhD, and Rhonda C. Vann, PhD.