AVALIAÇÃO DA INFLUÊNCIA NA TAXA DE CONCEPÇÃO DE PRIMÍPARAS UTILIZANDO IMPLANTES DE PROGESTERONA DE 1º E 2º USOS

Abstract

Reproductive performance is one of the most important characteristics of cattle breeding, in this sense, Artificial Insemination in Fixed Time (IATF) has been widely researched and disseminated in Brazilian herds. In the IATF protocols with the use of intravaginal progesterone implants, there are promising results, however, doubts about the advantages and the feasibility of reusing these devices persist. The objective of this study was to verify the efficacy of the reuse of intravaginal slow-release progesterone devices in IATF protocols in primiparous Nellore females, as this animal category physiologically presents a larger anestrus. The study was carried out with 234 primiparous Nellore cows, all of them with a body condition score (ECC) in the average of three, separated into two groups of 117 animals, in such a way that one would be the control group (G1) using progesterone devices of first use and the other group (G2), would be the test group, using the second use devices. With the realization of the study, it was possible to observe that there was no statistical difference that proves the loss or improvement in the efficiency of intravaginal progesterone implants with more than one use, however, regarding the conception rate the group with second-use devices had a percentage of highest conception.