Abstract

DE SANTIAGO-MIRAMONTES, María de los Ángeles et al. The presence of estrogenized females at the moment of male effect induce oestrous activity of goats in the mexican semi-desert. Rev. Chapingo ser. cienc. for. ambient [online]. 2011, vol.17, n.spe, pp.77-85. ISSN 2007-4018.  https://doi.org/10.5154/r.rchscfa.2010.09.081.

The objective of this study was to determine whether the presence of estrogenized females and sexually inactive males stimulates the estrous activity of anovulatory goats, and if the percentage of females estrogenized affects this response. Three groups (n = 31 each) of anovulatory females exposed to two males/group were used. The first group was exposed to six estrogenized females (G20 %), a second group was exposed to tree estrogenized females (G10 %), and the third group was exposed to six non estrogenized females (GO %). The total percentage of goats in estrus during the study was similar between the groups G20 and G20 % ( 93 and 90 %, respectively, P>0.05), but different in the group G0 %, where any female was in estrus (P<0.01). The onest of estrous activity was slower in the G10 % (167.8±17 h) than in the G20 % (142 ± 20 h, P<0.001). Our results suggest that at the time of the male effect, the presence of estrogenized females stimulates the estrus activity of the native anovulatory females from the Mexican semi-desert, and that the presence of 20 % of estrogenized females reduces the period between male introduction + estrogenizzed females regarding the onset of estral activity or the latency to the first estrus.

Keywords : Famale effect; seasonal anestrous; sexual activity.