Sexually active bucks counterbalance the seasonal negative feedback of estradiol on LH in ovariectomized goats

We showed previously that the permanent presence of bucks rendered sexually active by photoperiodic treatments, thereafter called photostimulated bucks, prevents the occurrence of seasonal anovulation; also, the introduction of these sexually active bucks, induces ovulations during seasonal anestrus. Here, we studied the response of ovariectomized goats bearing 12-mm subcutaneous implants filled or not with estradiol to sexually active males to determine 1) whether the permanent presence of such bucks prevents the decrease of LH despite the presence of a negative feedback by estradiol mimicking that of seasonal anestrus (experiment 1), and 2) whether the introduction of photostimulated bucks increases the plasma LH concentrations in spite of this negative feedback (experiment 2).

Source: Domestic Animal Endocrinology - March 30, 2017 Category: Endocrinology Authors: A.L. Mu ñoz, D. Chesneau, H. Hernández, M. Bedos, G. Duarte, J. Vielma, L.A. Zarazaga, P. Chemineau, M. Keller, J.A. Delgadillo Source Type: research