Fertilidade de fêmeas Nelore após inseminação artificial em tempo fixo conforme a contagem de folículos antrais

Abstract

Resumo -O objetivo deste trabalho foi determinar o efeito do número de folículos antrais sobre as taxas de concepção de fêmeas Nelore, em programa de inseminação artificial em tempo fixo (IATF). Para isso, 481 fêmeas foram submetidas a um protocolo de IATF e avaliadas quanto à contagem de folículos antrais (CFA) e ao diagnóstico de gestação. Os animais foram agrupados nas categorias de CFA baixa (<34 folículos), intermediária (34-53) e alta (>53). Não houve diferença entre as taxas de concepção obtidas nas categorias de CFA em IATF com uso de gonadotrofina coriônica.Termos para indexação: Bos taurus indicus, população folicular antral, taxa de concepção. Fertility of Nellore females after a fixed-time artificial insemination according to antral follicle countAbstract -The objective of this work was to determine the effect of antral follicle number (AFC) on the conception rates of Nellore females, in a fixed-time artificial insemination (FTAI) program. For that, 481 females were subjected to a FTAI protocol and evaluated for antral follicle counts (AFC) and pregnancy diagnosis. The animals were grouped into the AFC categories considered as low (<34 follicles), intermediate (34-53) and high (>53). There was no difference between the conception rates obtained for the AFC categories in FTAI protocol with use of chorionic gonatropin.

Molecular characteristics of granulosa and cumulus cells and oocyte competence in Nelore cows with low and high numbers of antral follicles

“…In this regard, Bos indicus cows have a higher number of AF on average compared with Bos taurus cows (Pontes et al., , ). In addition, variations in AF count have been reported between populations of the same breed (Rodrigues et al., ; Santos et al., ), which may be explained by different factors such as distinct nutritional management and genetic variabilities (Weller et al., ).…”