Abstract
Synchronization of estrus implies the manipulation of the estrous cycle or induction of estrus to bring a large percentage of a group of females into estrus at a predetermined time. Methods of evaluating synchronization systems include estrous response, synchronized conception rate, synchronized pregnancy rate, and pregnancy rate at various stages of the breeding season. Treatment of cattle with progestogens for less than 14 days was reported to not reduce conception rate. However, for these short-term progestogen systems to be effective in synchronizing estrus, a luteolytic agent must be incorporated. Estrogens are luteolytic when administered to cattle during the early part of the estrous cycle. Instead of administering an estrogen at the beginning of a progestogen treatment to reduce the length of progestogen exposure, a prostaglandin may be administered at or near the end of a progestogen treatment.
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