In order to select an excellent breed of fox, one must master the coat color, coat quality and body characteristics of the silver-black fox. nurture.

Silver-Black Fox

1. Coat color characteristics

(1) The strength of silver hair is divided by the length of the silver-white section on the needle hair, and the length is preferably 12-16mm.

(2) The silver hair rate should reach 75%-100%, that is, there are silver hairs from the base of the ears to the base of the tail, or at least 3/4 of them have silver hairs.

(3) The black band refers to a black band formed by the black needle hair and silver hair on the back of the fox from the base of the ear to the base of the tail. The black band of the silver-black fox is obviously better.

(4) Selection of the black hair tips on the silver ring The needle hair tips of the silver-black fox are in the shape of black fog, and the black hair tips should not be light or heavy, that is, the so-called fog, too dark, Too white is not good.

(5) The color of the silver ring requires pearl white, and other variegated colors such as chalk, yellowish, and brown are not good.

(6) The fluff-colored fluff is preferably slate or blue-gray.

(7) The tail is cylindrical, and the length of white hair on the tip of the tail should be more than 8 cm.

(8) The plush is dense, not tangled, and smooth. The length of the needle hair is 5-7 cm and the length of the hair is 2-4 cm.

2. Three-stage seed selection

(1) In the primary selection, those bred before February 20 and those produced before April 20 will be selected. For silver and black fox cubs, choose the big ones and save 50% to 100% more than the planned ones.

(2) Check the September-October check, choose large, plush, good-colored seeds, and reserve about 25% more.

(3) Selected at the time of skin harvesting in November, the male and female silver foxes that meet the above conditions should be selected for breeding, and those that do not meet the conditions should be resolutely eliminated, so as not to affect the next generation or even several generations .

3. Selection of annual male silver foxes

The body weight should exceed 7.5kg, at least 6.5kg, and the coat color should meet the above requirements; , No infectious diseases, the mother has more than 5 litters, her breast milk is good, and her cubs are well protected. This has a genetic factor, which is easy to be overlooked in the selection of seeds, and the selection of large, good hair does not consider its maternal traits; testicles Large, bilaterally uniform, no single testis or cryptorchidism; slender body, more than 65 cm; born before April 20; head and body are adapted to the size, but cannot be large or small or small and large; no Eye disease, spirits, erect ears, no scabies inside and outside the ears; large nose, no snot, no ulcers or salivation in the mouth; broad chest, well-developed muscles, long and wide back, no unevenness, long and round buttocks; strong limbs , the stock meat developed.

(1) Selection of annual female silver foxes

The coat color characteristics must meet the above requirements, and they should be born before April 20; the weight should be more than 6kg and the body length should be more than 65cm; The nipples are normal, more than 3 pairs; the genitals are normal, and there is no deformity; the mother has many litters, cares well, has good milk, has a high survival rate of cubs, and has no habit of picking and eating cubs; the selection of body shape should refer to the selection criteria of male silver foxes. , but to be supple and slender.

(2) Selection of female silver foxes over two years old.

The litters are more than 5, and the cubs are strong; the milk is good; The umbilical cord of the fox fox is broken after giving birth, and it is good to hug the ground after giving birth (to prevent freezing to death), without crushing the cub; the survival rate of the fox cub is high, and it does not die before weaning; the food intake is normal; the body condition recovers quickly after giving birth; no various Disease; early molting, early estrus (before 3 months); no self-biting;

no vaginitis and endometritis; It is difficult to mate during the estrus to refuse to mate and needs to be forced to mate); the pregnancy reaction during pregnancy is no or small, no internal suction, fetus, stillbirth, rotten fetus; no dystocia or the labor process is longer than 6 hours); the longer the no, the better Small phenomenon, 2-year-old body length and weight should be more than 1 year old, 3-year-old more than 2 years old, and 3-year-old body length and weight after 3 years old; no variation in coat color and plush. The female silver fox is kept for 2-4 years.

(3) Selection criteria for male silver foxes over two years old

No various diseases; mating times more than 10 times; Robust; no biting female fox quirks, no mate choice; 2-year-old weight and body length greater than that of 1-year-old foxes generally grow for 3 years, 85% longer in the first year, 10% longer in the second year, and 5% longer in the third year %) weight and body length, which do not meet the above requirements, such as infertility, few mating times, strong corner selection, biting female foxes, mated female foxes with fewer litters, weak fox growth, If there are diseases of one kind or another, and the weight and body length increase to a small length, it is not allowed to keep the seeds. The male silver fox is kept for 2 to 3 years.