BOVINE ESTROUS CYCLE

The Estrous Cycle in Dairy Cattle:

The normal non-pregnant cow enters estrus every18-24 days unless cyclicity is interrupted by a pregnancy or pathology.  Estrus lasts about 18 hours and ovulation occurs approximately 12 hours after the end of estrus.  During estrus, the cow is sexually attractive to both bulls and cows, and will stand firm when other animals attempt to ride her.  Optimal conception rates are achieved when insemination is done toward the end of standing estrus.

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Copyright 1999-2001
New Bolton Center Field Service Department
Students:  Keith Javic - Class of 2003, C. Nikki Conroy - Class of 2003