Yenikoye A
Reprod Nutr Dev (1980). 1984;24(1):11-9.
Annual variations in estrous and ovulation behavior were studied in 23 bicolored Peulh ewes for a period of 30 months. The percentages of estrus and ovulation shown over a year of observation were 76 and 86%, respectively. The average rate of ovulation was 1.3 +/- 0.04 (X +/- SEM). Reproductive activity was minimal from January to April, as the percentages of estrus and ovulation varied between 43.8 and 61% and between 53.1 and 86%, respectively. This period was marked by the advent of anestrus, interrupted frequently by silent and irregular ovulations. Anestrus lasted an average of 81.9 +/- 9.8 days (X +/- SEM). Reproductive activity was maximal from May to December, as the percentages of estrus and ovulation varied between 77 and 97% and between 87.5 and 100%, respectively. During this period ovarian activity was interrupted by prolonged diestrus which lasted an average of 24.9 +/- 3.3 days (X +/- SEM). The ovulation rate did not differ significantly (P greater than 0.05) between periods of minimal and maximal sexual activity. These results suggest that the reproductive potentialities of Peulh sheep on a good diet are comparable to those of certain ovine breeds in temperate zones. The results also suggest that anestrus in bicolored Peulh sheep is probably a different physiological process than the one observed in some breeds of sheep in which anestrus is marked by total ovarian inactivity.
对23只双色富拉尼母羊的发情和排卵行为进行了为期30个月的年度变化研究。在一年的观察期内,发情和排卵的百分比分别为76%和86%。平均排卵率为1.3±0.04(X±SEM)。1月至4月生殖活动最低,发情和排卵的百分比分别在43.8%至61%和53.1%至86%之间变化。这一时期的特点是进入乏情期,并经常被安静和不规则的排卵所打断。乏情期平均持续81.9±9.8天(X±SEM)。5月至12月生殖活动最高,发情和排卵的百分比分别在77%至97%和87.5%至100%之间变化。在此期间,卵巢活动被延长的黄体期打断,黄体期平均持续24.9±3.3天(X±SEM)。在性活动最低和最高的时期之间,排卵率没有显著差异(P大于0.05)。这些结果表明,营养良好的富拉尼绵羊的繁殖潜力与温带地区某些绵羊品种相当。结果还表明,双色富拉尼母羊的乏情期可能是一个与在一些绵羊品种中观察到的不同的生理过程,在这些品种中,乏情期的特征是卵巢完全不活动。