Evaluación de la tasa de preñez con protocolos de sincronización E2P4PGF2Α, con tres tiempos de retiro del dispositivo intravaginal, en vacas Holstein

Abstract

The present project was done in a cattle farm belonging to Town of Giron, village San Gerardo and the small place called Cristal. It lasted 6 months, for this project I used 15 cows of Holstein crossbred race, and cows producers of milk. The cows were between three and six years old, they had of two and five births. They were chosen under the same reproductive parameters and corporal conditions.