First, estrus identification Every year from April to April is the estrus season of foxes. In this season, the male fox is always in estrus. The estrus scrotum of the estrus was drooping, excited, and the amount of activity increased, chasing the female fox's buzzing cry. When the female fox estrus, the spirit is disturbed, loss of appetite, urination frequency conversion, often using the tongue to lick the external genitalia. External genital manifestations: early vulva swelling, valgus; the middle period followed by vulvar swelling, valgus, pink, clitoris exposed, round or oval, secretions were white, yellow curd-like, this time for the estrus (usually lasting 2 to 3 days), most likely to receive mating; late vaginal contraction, swelling, decreased secretions, dry mucous membranes, is the end of estrus performance.
Second, breeding
1. During the breeding period, the following work should be done: First, check the quality of male fox sperm. It is carried out in a room at 18°C ​​to 20°C. Use a glass rod or straw to insert 10 cm to 12 cm of the newly hatched female fox vagina. Dip or take a drop of secretions and place on a glass slide. Observe under a microscope 200 to 600 times. Straight forward, shaped like a dragonfly, the head and tail can be divided, uniform size. No deformity, that is normal, such a fox can allow them to participate in breeding. After repeated inspections, male foxes with no spermatozoa or poor semen quality should not participate in breeding.
2. Putting on the mating: Take the method of artificially putting on the mating, 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 the fox is afraid, the male fox can also be mated into the female fox cage. Mating time is best arranged in the morning or evening. Fox mating time is generally 30 to 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 methods: Because the fox is a seasonal estrus, ovulation animals, so its breeding should take the way of compounding day after day, that is, after the first match, but also on the following day, repeated 1 time, until the female fox refused Until mating. 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.
Third, pregnant fox pregnancy is 50 to 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 droop slightly. Before the childbirth, it can be seen that the nipple swells and sometimes even sees fetal movement. In the first week of prenatal delivery, the production box (70 cm in length, 50 cm in width, and 50 cm in height) should be kept well. Do not put grass in the production box. Due to the long umbilical cord of the fox, it is easy to cause death with grass adhesion. If the fox in the north wants to insulate the grass, it can add a layer of net to the grass.
Fourth, the birth time of litter size due to species, regional differences, the majority of silver black fox in late March in litter, Arctic fox in mid-April to late May calving. The farrowing is mostly at night or in the early morning, and the delivery time is about 1 to 2 hours. Most of them have 3 to 4 hours. The average litter size is 5 to 7 and the maximum number is 12.
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. When you must inspect, you must first lure the female fox out of the nest box, and then insert the partition, and then check the fox (the check should be sensitive and brisk): observe the number, development and sucking of the fox, and whether there is adhesion of the umbilical cord. . The newborn fox closed his eyes, had no hearing, no teeth, and his body was full of sparse lanugo and gray-black. The average weight of 60 grams to 90 grams, until the 14 to 16 days blink, and gradually grow teeth and canines. 18 to 23 days of age began to eat, 45 days of age can be divided into nests.
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Manual vision measuring machine is a precision measurement instrument that uses manual driving for 3 axes, and the measurement software is manual point taking.
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