ANS 3319C Reproductive Physiology and Endocrinology Estrous Synchronization & Heat Detection in Cattle Objectives 1) To introduce the tools needed to implement effective estrous synchronization programs. 2) To introduce the different estrous synchronization programs available to producers. 3) To review the process of heat detection in beef cattle and discuss the tools that can be used to increase it efficiency. Estrous Synchronization 1) Enhances the use of artificial insemination (AI) by increasing the number of cattle in estrus over a shorter period of time compared with unsynchronized cattle (See figure below). 0510152025303502468101214161820UnsynchronizedSynchronizedDay after PGF2treatment% exhibiting estrus2) Allows producers to effectively manage breeding schedules to fit in with other required work. 3) Greatly reduces or eliminates labor and time required for heat detection. 4) Greatly reduces days needed to inseminate the cattle. 5) Groups cattle into calving groups resulting in: Calves are more uniform in weight and age at weaning. Concentration of labor for calving and breeding seasons. Shortens the duration of calving season and subsequent breeding season. 6) Cows that breed early in the breeding season tend to wean older, heavier calves and more uniform calves during their lifetime and also maintain a yearling calving interval.
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