Studies on the reproduction in asses:I. Breeding season, oestrous cycle and period of oestrus
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概要
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We can not find any reports on the reproduction in jennies. In this study breeding season, oestrous cycle, period of oestrus, ovulation time, changes in the sexual organ etc. were studied.Results on the former three items are presented in this paper.1. It appears that the breeding season is from April to September, and there is a sexual rest season in December and January. February and March, October and November are the transition stages into and from the breeding season respectively.2. The duration of oestrus is from three to fourteen days, that is, 6.017±0.577 days on an average in 58 cases.3. The oestrous cycle has a range from 13 to 31 days, that is, 22.826±0.109 days on an average in 46 cases.4. The relation between sexual life and season, duration of oestrus and oestrous cycle in jennies are given nearly the same results as them in horses.
- 公益社団法人 日本畜産学会の論文
公益社団法人 日本畜産学会 | 論文
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