eef cattle producers using artificial insemination in their herds also can synchronize estrus (heat) to breed fertile females rapidly. Synchronizing Estrus in Cattle

Cows not conceiving will return to estrus again beginning about 18 to 25 days after the synchronization period. The females will still be synchronized to a slight degree, which gives a second chance to artificially inseminate each female in the early part of the breeding season. Without synchronization, the herd manager is faced with a 21-day period of continual estrus detection and only one opportunity for AI in most females. This is because only 5 to 7 percent of females will display estrus more than once during the first 21 days of breeding. For best results with an estrus synchronization program and to ensure optimum fertility, ranchers should: