Reproductive characteristics of Fox
The lifespan of foxes is 10-14 years, the number of breeding years is six to eight years, and the best breeding time for human generation culture is 2-5 years.
Foxes are animals that breed once a year, and the breeding season is during the Spring Festival. The reproductive organs of foxes show obvious seasonal changes due to the influence of photoperiod. It has been proved that the method of artificial light control can change the breeding cycle of fox and the mature period of quilt. Most male foxes can participate in mating during the breeding season. However, there are some old foxes or young male foxes who do not have the ability to mate for the first time.
The reproductive organs of female foxes are at rest in summer, the smallest size of ovary, uterus and vagina, the gradual increase of ovary from August to October, the development of follicles, the degeneration of corpus luteum, the disappearance of corpus luteum and the rapid growth of follicles in November. Estrus, ovulation tube, uterus and vagina also changed with the development of ovaries in the following spring, and the size and weight increased significantly. Fox is a spontaneous ovulation animal, two ovaries can ovulate alternately. The young foxes are sexually mature at the age of 9-11 months. According to statistics, about 20% of young foxes born later are not in estrus during the following breeding season.
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Breeding carnivorous dogs is very important.
If you want to raise a dog successfully, you must choose a good breed. In a general sense, a carnivorous dog refers to a F1 or F2 hybrid between a large purebred dog and a local dog, or a crossbreed between F1 and F2. The choice of purebred male dogs is particularly important. At present, the purebred male dogs selected in China are Tibetan mastiff, Dadan, St. Bernard and so on, among which the F1 generation of Tibetan mastiff is active and ferocious and not suitable for group breeding; Dadan F1 generation has a low meat yield. As the patrilineal breeding of meat dogs, St. Bernard dogs have the following advantages: fast growth, adult dogs 75mi 100
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The internal parasite of a snake
There are many kinds of parasites in snakes, such as whip tongue parasitic in snake lungs and trachea, heterotrematodes parasitic in snake gallbladder and so on. However, due to the short history of artificial breeding of commercial snakes and the limited production scale, there is not much communication on snake disease among snake farms, and the research on the status and control of internal parasites of snakes is not deep enough. Moreover, when some drugs are used to treat the drug parasite of snakes, if the dosage is small, it has no effect on the internal parasite; if the dosage is slightly larger, although it has not reached the lethal dose of the internal parasite,
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