is it possible to improve fertility with prolonged proestrus protocols? physiological bases, results and new perspectives

The objective of this work was to carry out a bibliographic search of all the programs with prolonged proestrus in the fertility of bovine cattle dedicated to meat production. The use of artificial insemination at fixed time (IATF) in cattle has not stopped growing in the countries of the region during the last 20 years, demonstrating that it is a technology that is here to stay. Its adoption curve is in a stage of maturity, having first been adopted by the most innovative and today it is already used by more pragmatic or conservative producers. Therefore, in this review we will emphasize the protocols that we have worked the most in recent years and with which high pregnancy rates have been achieved.