Effect of presence of the male on initiation of estrous cycle activity of goats

Sexual behaviour and gonadal activity during the year in the tropical Creole meat goat. I. Female oestrous behaviour and ovarian activity

“…Ovarian activity during these short oestrous cycles has not been studied systematically. However, as short cycles of identical length are induced by the presence of males (Ott, Nelson and Hixon, 1980 ;Chemineau, 1983), the short cycles in the present experiment are probably associated with the short lifespan of corpora lutea which secrete smaller quantities of progesterone (Chemineau, Poulin and Cognié, 1984 …”

Sécrétion de progestérone au cours du cycle induit par l'introduction du mâle chez la chèvre créole en anœstrus : effets de la saison

“…Dans la moitié des cas chez la brebis (Oldham et et la majorité des cas chez la chèvre (Ott, Nelson et Hixon, 1980 ;Chemineau, 1983) Chemineau, 1983) ; comme le montrent les résultats présentés ici, une sécrétion transitoire de progestérone accompagne sa mise en place. Cette sécrétion, chez tous les animaux, ne dure qu'une journée et ne dépasse pas 1 ng/ml de plasma.…”

Duration of the breeding season on the reproductive performance of Anglo-Nubian goats during dry and rainy periods

“…Dry season BS25 BS35 BS45 BS25 BS35 BS45 First 60 55 55 55 60 60 Second 30 35 35 20 20 15 Third -5 5 ---Total 90 95 95 75 88 a buck or ram into the midst of isolated females increases LH pulsatility and provokes a preovulatory LH peak stimulating final follicular development and ovulation. 2,5,[14][15][16][17] Mating events are expected to be observed within an 15-25 day period after male introduction to the female herd. 14,15,17,18 These results and the data described here support the hypothesis that females can exhibit from one to three estrous within an 35-day period, 17 since female goats have estrous cycle ranging from 18 and 22 days, 19 but estrous cycles of less than 17 days have been observed.…”

“…2,5,[14][15][16][17] Mating events are expected to be observed within an 15-25 day period after male introduction to the female herd. 14,15,17,18 These results and the data described here support the hypothesis that females can exhibit from one to three estrous within an 35-day period, 17 since female goats have estrous cycle ranging from 18 and 22 days, 19 but estrous cycles of less than 17 days have been observed. 1 Here, most female goats had one single estrous and only a small fraction exhibited three estrous during the DS (5%), and a second estrous was observed within an average period of 12.44 days.…”