Detection of estrus in beef cattle herds

Abstract

"Correctly detecting cows and heifers in estrus can be critical depending on how artificial insemination or embryo transfer is managed. Estrus, or standing heat, is the sexually receptive period of a cow's reproductive cycle that occurs just prior to ovulation. Behavioral and physiological changes can be observed to determine when a cycling cow is in estrus, which occurs every 17 to 24 days depending on length of the cow's estrous cycle."--First page.