化胎是指胚胎在長毛兔的子宮里早期死亡，逐漸被子宮黏膜所吸收，沒有明顯流產(chǎn)的表現(xiàn)，妊娠就終止了。產(chǎn)生化胎的原因很多，主要表現(xiàn)在以下幾個方面。

The embryo is the early death of the embryo in the uterus of the long haired rabbit, gradually absorbed by the uterus mucous membrane. There is no abortion, and the pregnancy terminates. There are many reasons for the birth of the fetus, which is mainly shown in the following aspects.

一、妊娠期飼發(fā)霉變質(zhì)飼料

1. Gestation moldy metamorphic feed

有些飼養(yǎng)場給妊娠母兔飼喂發(fā)霉變質(zhì)的飼料、草粉等，引起母兔腹瀉，導(dǎo)致體質(zhì)下降而出現(xiàn)化胎。

Some farms feed the pregnant rabbits with mouldy and metamorphic feed, grass powder and so on, causing diarrhea in the mother rabbit, resulting in the deterioration of the Constitution and the emergence of the foetus.

二、母兔消瘦

Two, emaciation of the mother rabbit

母兔消瘦、體質(zhì)弱，子宮黏膜薄，營養(yǎng)不足，胚胎著床后因營養(yǎng)供給不足而導(dǎo)致化胎。

The mother rabbit is thin, weak physique, thin uterine mucosa and insufficient nutrition, and the embryo is caused by insufficient nutrition after implantation.

三、環(huán)境溫度過高

Three. The temperature of the environment is too high

妊娠期飼養(yǎng)室溫度、濕度過高，非常是溫度超出了臨界溫度時，母兔抵抗力下降，出現(xiàn)化胎現(xiàn)象。

When the temperature and humidity of the feeding room were too high, especially when the temperature exceeded the critical temperature, the resistance of the mother rabbit decreased and the fetal phenomenon appeared.

四、受精卵生命力弱

Four. The vitality of the fertilized egg is weak

生命力較弱的精、卵結(jié)合后，胚胎發(fā)育到一定階段就終止發(fā)育。在生產(chǎn)中老年公兔配老年母兔、青年公兔配老年母兔、老年公兔配青年母兔、青年公兔配青年母兔等，都容易出現(xiàn)化胎性空懷。

After the combination of sperm and eggs with weak vitality, the development of the embryo is terminated at a certain stage. In the production of elderly male rabbits with older rabbits, young male rabbits with older rabbits, aged male rabbits with young female rabbits, young male rabbits with young female rabbits, are prone to fetal sex nonpregnancy.

五、飼料中長期缺乏與生育有關(guān)的維生素

Five, the long-term lack of fertility related vitamins in the feed

飼養(yǎng)時常年不喂青綠飼料，以干草粉補充纖維時又不重視補充維生素，非常是不重視補充維生素A、維生素E、維生素B1等及微量元素，導(dǎo)致化胎。

They often do not feed green feeds at any time, and do not pay much attention to vitamin supplements when supplemented with hay powder. Especially, they do not attach importance to vitamin A, vitamin E, vitamin B1 and trace elements.

六、生殖道器質(zhì)性病變

Six, organic pathological changes of reproductive tract

母兔妊娠期子宮、陰道發(fā)生炎性病變，危及子宮黏膜，出現(xiàn)化胎現(xiàn)象。

The uterus and vagina of the mother rabbit during pregnancy have an inflammatory disease, which endanger the uterine mucosa and appear the phenomenon of the fetus.

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