The estrus factors of Angora rabbits are not only regulated by hormones in receptors, but also influenced by seasons, environment, feed and mechanical stimulation. Therefore, the estrous cycle of Angora rabbits is a complex physiological phenomenon which is affected by internal and external factors.

　　(1)生理因素:長(zhǎng)毛兔的發(fā)情周期隨著卵巢功能和形態(tài)的改變而改變。根據(jù)卵巢的形態(tài)和功能，可分為卵泡期和黃體期。它們的替代和復(fù)發(fā)構(gòu)成了長(zhǎng)毛兔發(fā)情周期的連續(xù)循環(huán)。卵泡期卵泡上皮細(xì)胞分泌的雌激素促進(jìn)長(zhǎng)毛兔生殖器官的發(fā)育和第二性征的出現(xiàn)，使長(zhǎng)毛兔的生殖功能活動(dòng)達(dá)到高峰，產(chǎn)生性欲。但兔子在發(fā)情時(shí)不排卵，排卵必須經(jīng)過(guò)交配刺激作用10 ~ 12小時(shí)后才能產(chǎn)生，這種現(xiàn)象稱為刺激排卵。雄兔爬過(guò)雌兔并不是刺激排卵的條件，發(fā)情的母兔被其他雌兔反復(fù)爬過(guò)，也會(huì)引起排卵。在失去受精機(jī)會(huì)后，卵子會(huì)吸收所有的卵子。兔媽媽排卵后形成黃體，黃體期是黃體分泌黃體酮的一個(gè)相當(dāng)穩(wěn)定的時(shí)期，黃體期可以維持血液中一定的水平，抑制卵泡發(fā)育。黃體酮促進(jìn)子宮內(nèi)膜增生，分泌一種叫做“女兒奶”的營(yíng)養(yǎng)物質(zhì)，為受精卵的植入和分裂創(chuàng)造條件。如未受精，黃體通過(guò)3 ~ 5天，被正式分泌的前列腺素所溶解，從而黃體酮水平迅速下降，這種變化導(dǎo)致卵泡期開始，隨后重新出現(xiàn)發(fā)情。

　　(1) Physiological factors: the estrous cycle of Angora rabbits changes with the changes of ovarian function and morphology. According to the shape and function of ovary, it can be divided into follicular stage and luteal stage. Their replacement and recurrence constitute the continuous cycle of oestrus cycle. Estrogen secreted by follicular epithelial cells in follicular phase promotes the development of reproductive organs and the appearance of secondary sexual signs, which leads to the peak of reproductive function and sexual desire. However, rabbits do not ovulate when they are in estrus. Ovulation can only be produced after 10 to 12 hours of mating stimulation. This phenomenon is called stimulating ovulation. It is not the condition to stimulate ovulation that the male rabbit climbs over the female rabbit. If the estrous female rabbit is repeatedly climbed over by other female rabbits, it will also cause ovulation. After losing the chance of fertilization, the egg will absorb all the eggs. Luteal phase is a stable period for luteal secretion of progesterone. Luteal phase can maintain a certain level of blood and inhibit follicular development. Progesterone promotes endometrial hyperplasia and secretes a nutrient called "daughter's milk", which creates conditions for the implantation and division of fertilized eggs. If not fertilized, the corpus luteum is dissolved by prostaglandins which are officially secreted for 3 to 5 days, thus the level of progesterone drops rapidly. This change leads to the beginning of follicular period and subsequent re emergence of oestrus.

　　(2)季節(jié)影響:母兔發(fā)情活動(dòng)也隨季節(jié)和光照時(shí)間的變化呈周期性變化。春季，當(dāng)光照時(shí)間由短變長(zhǎng)時(shí)，雌兔的性活動(dòng)也逐漸增加。當(dāng)光照時(shí)間由春分前后的短時(shí)間增加到12小時(shí)時(shí)，母兔發(fā)情率為全年更高，發(fā)情周期短，交配成功率高。這種性活動(dòng)的高峰，隨著光照時(shí)間的逐漸增加，延長(zhǎng)到夏前后(即夏)。,6月下旬)。光照時(shí)間由長(zhǎng)逐漸縮短后，雌兔的性活動(dòng)逐漸減弱，直到冬(12月下旬)，雌兔發(fā)情率降全年低潮。其特點(diǎn)是發(fā)情周期長(zhǎng)，表現(xiàn)不明顯，受孕率低。

　　(2) Seasonal effect: the estrus activity of female rabbits also changed periodically with the change of season and light time. In spring, when the time of illumination changed from short to long, the sexual activity of female rabbit also increased gradually. When the light time increased from the short time before and after the vernal equinox to 12 hours, the estrus rate of female rabbit was the highest in the whole year, the estrus cycle was short, and the mating success rate was high. The peak of this kind of sexual activity, with the gradual increase of light time, extends to around the summer solstice (that is, the summer solstice). , late June). The sexual activity of female rabbits decreased gradually after the time of illumination decreased from long to short, until the winter solstice (late December), the oestrus rate of female rabbits decreased to the low tide of the whole year. It is characterized by a long oestrus cycle, not obvious performance, low pregnancy rate.

　　此外:長(zhǎng)毛兔品種兔媽媽兔的性活動(dòng)也受到天氣的影響。天氣好的時(shí)候，母兔熱性能明顯，性欲旺盛，交配效果好。雨天、刮風(fēng)、下雪天，雌兔的性欲和交配效果較差。

　　In addition, the sexual activity of mother rabbit, a long haired rabbit, is also affected by the weather. When the weather is good, the female rabbit has obvious thermal performance, strong sexual desire and good mating effect. In rainy, windy and snowy days, the sexual desire and mating effect of female rabbits were poor.

　　(3)飼料因素:飼料成分的質(zhì)量直接影響母兔的性行為。綠色飼料不足時(shí)，特別是維生素嚴(yán)重缺乏時(shí)，母兔發(fā)情行為少，交配率低于10%。當(dāng)綠色飼料充足時(shí)，長(zhǎng)毛兔種兔媽媽兔有規(guī)律的發(fā)情期。特別是在春季3 - 4月，由于飼料豐富，營(yíng)養(yǎng)價(jià)值高，母兔發(fā)情率和受孕率可高達(dá)80%以上?

　　(3) Feed factors: the quality of feed ingredients directly affects the sexual behavior of female rabbits. When the green feed is insufficient, especially when the vitamin is seriously deficient, the estrous behavior of female rabbits is less, and the mating rate is less than 10%. When the green feed is enough, the mother rabbit has regular estrus. Especially from March to April in spring, due to the rich feed and high nutritional value, the oestrus rate and conception rate of female rabbits can reach more than 80%?

　　(4)機(jī)械刺激:在沒有外界刺激的情況下，單獨(dú)飼養(yǎng)的雌性長(zhǎng)毛兔發(fā)情不明顯。如果讓長(zhǎng)發(fā)兔子繁殖兔子?jì)寢屚米舆M(jìn)行團(tuán)體運(yùn)動(dòng),給異性或同性進(jìn)行追逐對(duì)方爬的機(jī)會(huì),兔媽媽然后顯示明顯的性行為,并導(dǎo)致性欲增加,使母親兔子不熱時(shí)期提前熱。發(fā)情期的母兔也表現(xiàn)出主動(dòng)尋找公兔、爬過(guò)其他公兔或母兔，對(duì)于交配姿勢(shì)、抓洞等現(xiàn)象，此時(shí)交配，可以使母兔的妊娠率和產(chǎn)仔率大大提高:產(chǎn)仔數(shù)大大提高。

　　(4) Mechanical stimulation: in the absence of external stimulation, the estrus of female Angora rabbits raised alone was not obvious. If the long hair rabbit is allowed to breed the mother rabbit for group sports, giving the opposite sex or the same sex the chance to chase each other to climb, the mother rabbit then shows obvious sexual behavior, and leads to increased sexual desire, making the mother rabbit not hot in advance. The female rabbits in estrus also show the initiative to look for male rabbits and climb over other male or female rabbits. For the phenomenon of mating posture and hole grabbing, mating at this time can greatly improve the pregnancy rate and litter rate of female rabbits: the number of litter is greatly increased.

　　以上就是蒙陰長(zhǎng)毛兔對(duì)長(zhǎng)毛兔的發(fā)情期都哪些外部因素的影響的詳細(xì)介紹，想要了解更多請(qǐng)點(diǎn)擊官網(wǎng)http://www.bdf027.com

　　The above is a detailed introduction of what external factors affect the oestrus period of Mengyin long hair rabbit. For more information, please click http://www.bdf027.com