The fox is estrus once a year. From January to mid-April, it is time for estrus and breeding. When close to the start of breeding, the spouse of the male and female fox should be selected. When mating, it is best to send the female fox to the fox. Mating, if you can't mate after 20 minutes to 30 minutes, you should take out the female fox and then try to breed on the second day. A male fox can try 6 to 8 female foxes for 1 day. In order to avoid the real estrus fox in the case of sexual activity in the female fox, the female fox must be checked frequently during the breeding period. The mating staff should first master the changes of the female fox during the estrus period, as well as the performance and sexual behavior of the female fox, and increase the mating rate and the number of maternal foxes.
The fox's reproductive and physiological characteristics fox is a seasonal single estrus animal, breeding only once a year, multiple births, generally 1 child can produce 6 to 12 foxes. Foxes can only estrus, mating, ejaculate, ovulate, and fertilize during the breeding season. In the non-breeding season, the fox's testis and ovaries function at rest. During the summer, the ovary and uterus of the female fox are in atrophic state. By the end of August to mid-October, the ovary of the female fox develops gradually, and the corpus luteum disappears in November. At the same time, the follicles grow rapidly and the sexual organs develop. The general silver black fox begins to heat in mid-January; the blue fox begins to heat in mid-February. The male fox testicles are very small in the summer, only 1.2 grams to 2 grams, do not produce sperm, to the end of August to early September testicular development, weight and volume have increased, close to January, the testicle weight can reach 3.5 grams to 4.5 Grams, and can produce mature sperm.
The female fox is a spontaneous ovulation animal. The follicles produced in one estrus are not mature and ovulate at the same time. Like sows, they ovulate one after another. The first mature follicle ovulates first, and the maternal fox is only mated once. The pregnancy rate is only 70. About %, but also the number of births per child is also less; if the second day of the mother fox compounded, the pregnancy rate of up to 85%, 3 times the foxes remix, almost all of the pregnancy, the number of births per child is also more. In northern China, the general mating period of female foxes is: silver fox in late January to late March of each year; blue foxes are in late February to late April each year.
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