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母畜发情周期的阶段划分及其各阶段的特点

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正确答案:

发情前期:黄体萎缩,卵泡开始生长,生殖道微充血肿胀,腺体分泌逐渐增加,无性欲表现。

发情期:有性欲表现,外阴部充血肿胀,子宫充血,腺体分泌增加,流出粘液,卵泡发育很快。

发情后期: 性欲由激动转入静止, 子宫颈口收缩, 腺体减少而粘稠, 子宫内膜增厚, 卵泡破裂, 黄体形成。

间情期:性欲完全停止,子宫膜由增厚变为萎缩,腺体变小,分泌量少,黄体已发育完全。

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