Sexually active vasectomized bucks stimulate and maintain sexual ciclicity in the seasonally anestrus goats
DOI:
https://doi.org/10.59741/agraria.v12i2.508Keywords:
caprine, male effect, estrousAbstract
The aim of this study was to determine the ovulatory and estrus be havior responses of the seasonally anestrus goats exposed to vasectomized sexually active and inactive males Two bucks were submitted to a day-long treatment (16 h of light per day) from November 1st to January 15th to stimulate their sexual activity in March and April. Another two males were submitted to natural photoperiod conditions. Multiparous and anovulatory goats were divided in two groups (n = 10 each one) balanced for body weight and body condition score. One group of goats was exposed to sexually active males (SA) and the other group of goats was exposed to sexually inactive males (SI). The contact between males and females was for 55 days. Ovulations were determined with plasma concentrations of progesterone. Estrous behavior was detected twice daily. The goats in SI group didn’t display ovula tory or estrous behavior responses (0/10), while all the goats in SA group ovulated and displayed estrous behavior (10/10; P = 0.0001). In last group, most of goats displayed a short estrous cycle (5.3 ± 0.3 d; 7/10) followed by a normal estrous cycle (7/7); the majority of them (6/7) showed anothernormal estrous cycle. The other goats (3/10) displayed a normal estrous cycle after male introduction and after that showedanother cycle more. The sexually active vasectomized males stimulateand maintain the sexual activity of the goats in almost two normal estrous cycles.
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