Use of Ovsynch/TAI for Postpartum or Post-service Anestrus in Dairy Cows and Effects of Some Factors Affecting Conception Rate

Abstract

Postpartum as well as post-service anestrus is a major cause of a prolonged interval between calving and conception.

Ovulation synchronization/timed artificial insemination (OVS/TAI) is known to be effective to increase a submission rate after voluntary waiting period without heat detection. However, conception rates after OVS/TAI vary greatly among different herds. Factors contributing to the variation need to be clarified to improve the conception rate after OVS/TAI.

Occurrence of estrus prior to the day of timed insemination is another problem with this protocol. Objectives of this study are to show the effect of OVS/TAI for the treatment of postpartum or post-service anestrus, describe effects of some factors on the conception rate and to investigate the occurrence of estrus before the day of TAI.