Efeitos da pré sincronização antes da primeira IATF pós parto em vacas Girolando

Abstract

Reproduction is one of the bottlenecks in dairy farming, so that the reproductive rates of dairy farms are improved, new managements and techniques are studied. The objective of this work was to test the efficiency of a pre-synchronization protocol carried out before the first postpartum FTAI in a herd of primiparous and multiparous Girolando cows, aiming at a higher conception and pregnancy rate on the property, and to reduce days in lactation (DEL) average of lactating cows. In this work, the animals were evaluated after the mean voluntary waiting period (PVE) of the property and submitted to the pre-synchronization protocol with the use of progesterone via intravaginal device for seven days. After these days of use, the device was removed and estradiol and prostaglandin cypionate was applied. Ten days after the removal of the progesterone implant and application of the medications, the cows received the following protocol for insemination: D0: new intravaginal device with one gram of progesterone (P4) and GnRH (buserelin); D7: administration of prostaglandin; D8: removal of the P4 device and administration of estradiol and prostaglandin cypionate; D10: insemination of all animals. Thirty days after insemination, the pregnancy diagnosis was made. Thus, it was possible to measure the herd's pregnancy rate using the pre-synchronization protocol to verify its efficiency. The results obtained showed that the reproductive efficiency of the herd was not improved with the adoption of pre-synchronization, obtaining results similar to previous inseminations performed without the use of this protocol. Therefore, the use of the protocol is not justified.