(I) Selection of young fox Three foxes of young foxes born in the same year need to be selected, namely primary selection, selection and selection. 1. Primary: Performed at weaning points. The main basis for selection is the pedigree, the traits of the parents, the date of birth and the growth and development of the fox, and so on. Requires clear pedigrees, good parental traits, early birth of the fox (silver foxes are born before April 20th, Arctic foxes are born before May 20th), and robust development. 2. Selection: Silver Fox In mid-August, the Arctic Solitary was performed in mid-September (ie, when the young fox was 4-4.5 months old). All young foxes with fast growth and large size (4 months old foxes weighing 4 to 4.5 kg and body length of 60 cm or more) are all left. The number of stays in this election is 25% more than the number of species left at the end of the year. -30%. 3. Selection: Before slaughtering (11-12 months). The silver fox requires black and black hairs on the body and tail, silver hairs account for more than 70%, silver rings have a “mist†shape, and its width is not more than 10-15 mm. It is suitable for the back with a black belt and dense villi. It is dark gray. The needle hair is all light blue, no stray hair, silver strength, needle-like luster, dense as silk. (b) The choice of adult fox requires the same quality as the young fox. 1. Body Type: In December, the male silver fox weighs more than 6 kg and has a body length of 65 cm or more. The female silver fox weighs 5.5 kg or more and has a body length of 61 cm or more. Male arctic foxes are more than 5 kilograms and their body length is longer than 63 centimeters. Female arctic foxes weigh more than 4.5 kilograms and their body length is more than 60 centimeters. Reduce small and deformed foxes. 2. Breeding production performance: Female silver foxes have more than 4 litters, more than 7 arctic foxes, no evil, strong maternal, and high milking power. 3. Fox age: silver fox should not exceed 5 years old, Arctic fox does not exceed 6 years old. If the fox is too old, its fertility will decline and it should be eliminated when slaughtered. People suffering from chronic diseases, loss of appetite, malnutrition, body weight loss, and hair change delay are eliminated.
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