Selection and Matching Technology of Silver Black Fox

1 selection

To select good foxes, you must master the coat color, wool character, and body characteristics of the silver black fox under the conditions of standard coat color, wool quality, body shape, and characteristics.

Retention and cultivation.

1.1 color characteristics

1.1.1 The rate of silver hair is to reach 75%-100%, that is, there are silver hairs from ear root to tail root or at least 3/4 silver hair.

1.1.2 The silver wool strength is divided by the length of silver white on the needle hair, and the length is preferably 12-16mm.

1.1.3 The color of the silver ring is white, and other colors such as chalk, yellowish, and brown are not good.

1.1.4 Selection of Black Hair Tips on Silver Rings The hair tips of silver black foxes are black misty. The black hair tips are not light or heavy, which is called fog.

Black and white are not good.

1.1.5 Black belt refers to a black belt from the ear root to the tail root formed by the black hairs and silver hairs on the back of the Fox ridge. The black belt of the silver black fox is obviously better.

1.1.6 Fluffy fluff is better with slate or grayish gray.

1.1_7 tail cylinder, tail hair length of 8cm or better.

1.1.8 Plush dense, not tangled, smooth, with 5 to 7cm in length and 2-4cm in length.

1_2 three-stage selection

1.2.1 Primary Selection Silver and black foxes that were produced prior to 20th of February and before April 20th were selected, and the large seed selection was 50% to 100% more than planned. .

1.2.2 Re-election For the October-October re-election, choose a large head, a good stuffed animal, and a good color, and leave 25% more.

1.2.3 Selection During the selection of skins in November, the male and female silver foxes that meet the above conditions must be selected, and those that do not meet the conditions must be eliminated resolutely so as not to affect the next generation or even several generations.

1.3 Selection of one year old male silver fox

The body weight is more than 7.5kg, and the minimum is not less than 6.5kg. The coat color meets the above requirements. The body is robust and free from infectious diseases. Its mother has more than 5 mothers and its breast milk is good and the shin guard is good. This has genetic factors. One point is easily overlooked when choosing a species, choose large, good hair regardless of its parent traits; large testicles, bilateral uniformity, no single or cryptorchidism; body slender, more than 65cm; born before April 20th Head and body

Adapt to size, not big head, small body or small head, large body; no eye disease, God t, ears upright spirit, no ears inside and outside the nostrils; nose no nose, no oral ulcers, no runny nose; chest width, muscular The back is long and wide. It cannot be uneven. The hips are long and round. The limbs are strong and the flesh is developed.

1.4. Selection of one-year-old mother silver fox

Hair color characteristics to achieve the above requirements, born before April 20; weight above 6k'g, body length above 65cm; nipple normal, more than 3 pairs; normal genitals, no malformation; Good milk quality, high survival rate of pups, no embarrassment, no appetite, and appropriate selection of male silver foxes, but should be soft and fine.

1.5 Two-year-old male silver fox selection criteria

No disease; Mating frequency is 10 times or more; the mated fox has good calving, has lots of litters, and is strong and healthy; there is no tearing bite and female fox cubs, no spouse; the 2-year-old body weight is longer than its 1-year-old f The general fox grows for 3 years, 85% for the first year, 10% for the 2nd year, and 5% for the 3rd year). The body weight and body length do not meet the above requirements. For example, the female fox is infertile and has mating times. Less, extraordinarily strong, biting foxes, mating foxes with fewer litters, weak foxes, diseases of one kind or another, and body weights that grow up to small lengths, are not allowed to remain. The official silver fox stays for 2 to 3 years.

1.6 The choice of mother silver fox for two years

There are more calves, more than 5, well-behaved; milk is good; not oysters, ate, care darling, after the birth of the umbilical cord off the ground is good, gave birth to a good grazing (antifreeze die), do not pressure die The fox’s survival rate is high, and it does not die before weaning; food intake is normal; body condition recovers quickly after giving birth; there are no various diseases; hair replacement is early, estrus is early (before March); no self-bite;

No vaginitis and endometritis; normal sexual behavior (normal estrus mating, no hidden estrus, difficult to match with estrus during estrus

Forced mating); Pregnancy pregnancy response is no or small, no suction, chemical, stillbirth, rotten fetus; gestation period without dystocia or labor length f6 hours

Upper); no longer the smaller the phenomenon, 2 years old body length, weight should be more than 1 year old, 3 years old than 2 years old, 3 years old to maintain 3 years of body length and weight; coat color and plush without mutation. The female silver fox stays for 2-4 years.

2 matching

2.1 Principle

Old (more than 2 years old) with little (1 year old), old and old; less old; public fox's trait must be stronger than the female fox, with excellent traits of the public fox with excellent traits of the female fox, with the characteristics of a good male fox with The common female fox does not have poor usability. If it is necessary to breed some species of outstanding foxes, such as individual large, plush special good, extra litter, etc., can also be used for mating with a particularly good traits, such as body length and weight, silver fox or The female body weight is more than 10kg, and if it is a fox or a fox with a very good plush and a normal body weight, etc., then it is gradually selected.

2.2 Sex ratio of male and female foxes

In general, the ratio of males to females is 1:2-3, and the male fox should not be less. If there are less than 10 female foxes, male and female foxes should be 1:2, because some male foxes have strong spouses and cannot be used for breeding. They are not suitable for other farms to use in series. Therefore, many foxes have room for selection, and With the kind of part you can sell hides for sale. If the silver fox is raised, the female fox can be kept 1:3. Because the fox has more room to choose and make full use of it, generally speaking, foxes that cannot be mated account for about 10%, and mating accounts for about 80%. , and about 10% of the extraordinary ability to mate, (abnormal mating ability refers to mating more than 30 times in an estrus season). No matter how strong the mating ability is, regardless of the weight of the male fox, it is better to use medium and upper body weight.

2.3 age ratio of fox

What proportion should be appropriate for the age of silver fox and fox species is a question that needs to be explored. The author's opinion is: 1 age ratio of male foxes, young and old is suitable for 2:1. If you choose to have strong mating ability, you can use 1 for 2 or 3, and fox for males generally does not exceed 3 years old. If you are over 3 years old, kind The public fox is less likely to fall or can't breed. The age ratio of the two female foxes was 1:1 or 1:2. The old fox had more stress responses and less foxes. The old fox was better than the fox.

3 Seedlings have long-term plans

A fox field can be built in 1 year, but the improved species is not a good one year. Even if the fox standards purchased from the foxes are all good, their offspring may not be all good. Therefore, it is impossible for a fox field to establish its own excellent population without 3-5 years.

Variations may occur in the selection and selection of breeding foxes. Although the variation is very small, as small as one millionth, the variation is absolute and the change is relative. For example, silver black fox is a variant of red fox, snow fox is a variant of blue fox, white fox is a variant of standard fox, and various foxes are derived from mutations and hybridization mutations of red fox and silver fox, silver fox and black fox. The blue-husband intergeneric hybrid makes the fox's coat color diversity, but it cannot be preserved. When matching, once the line is very thick, don't give up the breeding of new strains or varieties. I have heard of the special case of deuterium variation: one is black and white and the other is yellow. However, it is a pity that the owners of these two types of mutations do not know how to cultivate mutations and kill them.

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