1. Reproductive force is not only manifested in more litters per litter, shorter pregnancy period, but also in more than one year of childbirth, females can be fertilized soon after delivery. In addition, it also shows that the rabbits have fast growth and early sexual maturity. 2. The uterus of the double uterus and vaginal ejaculation female rabbit is the original double uterus type, and the vagina is quite long. The male rabbit's penis is shorter. This peculiar genital structure determines that in the natural mating situation, male rabbits ejaculate in the vagina, both sides of the uterus are pregnant. However, in the artificial insemination, if the vas deferens inserted too deep, it may be inserted into one side of the cervix, resulting in one side of the uterus conceived, the other side infertility phenomenon. 3. Stimulating ovulation In general, when the female rabbit reaches sexual maturity, it is estrus once every certain time, the estrus process is also accompanied by ovulation, and ovulation does not require external stimulation, and spontaneously occurs, which means spontaneous ovulation. There is no obvious estrous cycle in females, and ovulation is not an inevitable consequence of estrus. Mature eggs in the ovaries are not easily excreted without being sexually stimulated and are absorbed by the body. The main reason is that the pituitary gland of the female rabbit does not spontaneously release an amount of luteinizing hormone sufficient to cause rupture of the mature follicle. This feature is beneficial in production, practice has proved that in the absence of mating, the female rabbit chorionic gonadotropin injection can also promote ovulation, but long-term use will make the uterine wall thickening, affect reproduction, it is recommended to take The male rabbit ligating the vas deferens was mated with the female rabbit to induce ovulation in the female rabbit. 4. Male Rabbit "Summer Infertility" It has been reported that ambient temperature and light are a potential factor for rabbit reproduction. According to tests, in March, the rabbit had the highest ejaculation and sperm density, and the highest sperm motility. In the summer (mainly in July), the sperm motility decreased, the density decreased, and the proportion of dead spermatozoa and deformed sperm increased, and the libido decreased. Due to the effects of temperature, light, etc., causing a series of changes in the rabbit's physiology, the male rabbit's testicles were reduced by 60% in July, the endocrine system was disordered, the libido decreased, the appetite decreased, and the digestion and absorption capacity weakened. The phenomenon that it is difficult to breed in summer is called "Male Rabbit Summer Infertility". 5. The female "fake pregnancy" Some female rabbits ovulate without sexual fertilization after sexual stimulation, often lead to "pseudo-pregnancy" phenomenon, such as not receiving male rabbit mating, breast expansion, title mat mat nest, etc., duration about 16 -17 days. The reason may be caused by sexual stimulation of infertile male rabbits, or it may be that the female rabbits chase each other to cause ovulation in the female rabbit. According to reports, at the end of the pseudo-pregnancy, breeding is more likely to be affected. China Agricultural Network Editor
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