为什么不受精母鸡也能下蛋?

2025-04-05 13:28:55
推荐回答(4个)
回答1:

母鸡的受精过程与我们人类并不一样,要知道公鸡是没有突出的生殖器的,而是靠泄殖腔排出精子的。也就是说,公鸡与母鸡交配时,只需要将它的泄殖腔对准母鸡的生殖管道,将精液送到母亲的生殖管道,母鸡再将其保存起来。

等到母鸡的卵细胞形成后,就会将事先存好的精液与自己的卵细胞相结合,将鸡蛋清和外层的碳酸钙包裹起来,也就形成了受精卵。

如今在市面上见到的鸡蛋大部分都是养殖场养殖的,鸡蛋大部分都是未受精的。一般在农村大院里自己养的鸡,才有可能获得受精的鸡蛋,毕竟许多农村人养鸡也是为了让其进行繁殖赚钱,才会养公鸡和母鸡的。

扩展资料

母鸡开产前后主要生理变化

产蛋鸡从16周龄起进入预产期, 25周龄可达到产蛋高峰。这段时间, 母鸡不仅体重在增长, 生理上也发生着急剧变化。母鸡卵巢和输卵管的体积、重量与其功能密切相关。1日龄母鸡的卵巢平均重0.03g。未成熟母鸡的卵巢长约15mm, 宽约5mm。

卵巢内含有大量的卵母细胞, 其数量由600~500000个不等, 用显微镜可观察到12000个, 但仅有少数达到成熟排卵。母鸡有4月龄和5月龄时, 卵巢重量分别增至2.66g和6.55g。

卵巢和输卵管从11周龄起逐渐生长发育, 16周龄加快, 19周龄前后达到高峰。在开始性成熟时, 卵巢重量增至40~60g。这是由于发育较快的4~6个滤泡和卵黄物质积聚的结果。输卵管在静止期长度是15.4cm, 产蛋期变为65~81cm不等, 重量约为41.5g。

在开产前期, 母鸡体重要增加400~500g, 其中有40%~70%为生殖系统的增重;骨骼增重15~20g, 有4~5g为钙的储备。小母鸡大约在产第一枚蛋的10d前, 开始沉积髓质骨, 髓质骨约占小母鸡全部骨骼重量的72%。

开产后, 泄殖腔变大而润湿, 耻骨尖变薄, 间隙变宽, 龙骨与耻骨间距离变宽;头部皮肤变薄, 冠和肉垂鲜红, 触摸时有温感;喙、跖骨等部位黄色逐渐变淡。当大部分鸡开产后, 凡不具有上述特征的鸡, 可认为是未开产鸡而加以淘汰。

参考资料来源:

百度百科-母鸡

回答2:

为什么母鸡没有公鸡,也能下蛋?

回答3:

为什么母鸡没有受精却能生鸡蛋

回答4:

鸡蛋就是母鸡排出的卵,不管受不受精都能排卵,不过受精卵能孵化小鸡,不受精孵不出小鸡.

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