Proper breeding is the key to improving the efficiency of artificially reared foxes. The breeding techniques are now introduced as follows for reference: The estrus identification is from January to April each year in the estrus season of foxes. In this season, the male fox is always in estrus. The scrotal scrotum of the estrus rose apparently drooping, excited, and increased in activity, chasing the female fox and making a squeak. When the female fox is estrus, the spirit is disturbed, loss of appetite, urination frequency conversion, and often using the tongue to add external genitalia. External genital manifestations: Initial vulva swelling, valgus; mid-stage, followed by vulvar swelling, valgus, pink, clitoris exposed, round or oval, secretions are white or yellow curd-like, this time for the estrus (usually last 2 ~ 3d), the most likely to receive mating; late vaginal contraction, swelling, decreased secretions, dry mucous membranes, marking the end of the heat. Breeding 1. During the breeding period, the following work should be done: First, check the quality of male fox sperm. In a room at 18 to 20°C: Insert a glass rod or pipette into the vagina 10 to 12 cm from the newly hatched female fox. Dip or take a drop of secretions and place it on a glass slide under a microscope 200 to 600 times. Observations, such as the number of sperm are mostly straight forward, shaped like a beak, head and tail can be divided, uniform size, no deformity, that is normal, such a public fox allows them to participate in breeding. After several inspections, no male fox with poor sperm quality or semen quality can participate in breeding. 2. Putting on the mating: Take the method of artificially placing the mating type, and put the female fox into the public fox cage because the fox is used to mating in its own cage. If the female fox is impatient or timid, the male fox can be mated into a female fox cage. The mating time is best arranged in the morning or evening. The mating time of the fox is generally 30-40 minutes. Some up to 1 hour. Each male fox can mate 1 or 2 times a day, let it rest for 1 day and then mate every 7 days. Each male fox can usually mate 8 to 16 times throughout the breeding period. 3. Breeding method: Because the fox is a seasonal estrus, ovulate animals, so the breeding should take the way of compounding day after day, that is, after the first match, but also on the following day to repeat 1 time, until the female fox refused to mate . Compounding can greatly increase fertility. You can also receive the compound after 1st mating, 1 to 2 days apart. For those female foxes with strong mate characteristics, the male fox should be replaced for double mating or multiple mating, that is, a female fox mates with two or more male foxes. Silver black fox best equipped with more than 2 times, Arctic fox with 3 to 4 times. The pregnant period of pregnant fox is 50-60 days. When the female fox is pregnant, she sleeps and becomes less active. From 25 to 30 days, the female fox's abdomen can be seen to swell and hang slightly. Nipple swelling can be seen before labor, and fetal movement can sometimes be seen. In the first week of prenatal delivery, a good delivery box (70cm in length, 50cm in width and 50cm in height) should be placed in the box. The grass should not be placed in the box. Because of the long umbilical cord of the fox, it is easy to cause death with the grass. The mother fox can leave her nest before childbirth. The time of farrowing and littering vary due to breeds and regions. Silver foxes are mostly littered in late March. Arctic foxes are littered from mid-April to late May. The farrowing is mostly at night or in the early morning, and the delivery time is about 1 to 2 hours, and more than 3 to 4 hours. After the birth, check the health conditions of the female fox and the fox. When you see the mother fox discharge coal tarry fetal stools, you can check the birth of the nest. Check if the fox is to be eaten while the female fox is eating. If the female fox is always in the nest box, do not forcibly expel it. If you can snoop on the normal voice of the fox, you may not check it temporarily. During the inspection, the mother fox must be decoyed to the nesting box, and the partition should be inserted. Then, the fox must be checked (the movement of the fox should be sensitive and brisk); observe the number, development and condition of the fox, and whether the umbilical cord adheres. The young fox closed his eyes, no hearing, no teeth, and his body was full of sparse lanugo, grayish black. The average weight of 60 ~ 90g, until the 14 to 16 days blink, and gradually grow teeth and canines. 18 and 23 days of age began to eat, 45-day-old can be divided into nests.
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