Technical points of litter division and primary selection of fox, raccoon dog and mink

1 minute nest key point

Before the litter is divided into nests, the cage box to be used must first be inspected to repair the damage, and then all the cages must be disinfected and set aside. Then wash the required food plates and water boxes and disinfect them and use them after the nests are divided.

Young foxes generally divide their nests at 35-60 days old, raccoon dogs at 45-60 days old, and young minks at 40-45 days old. Young animals can not divide their litters prematurely, because their independent living ability is weak, which affects their growth and development, and is easy to cause disease and even death; too late litter, due to excessive physical consumption of mother animals, is not easy to recover, affecting next year's production. The specific litter time is mainly determined by the development of the offspring and the breast-feeding ability of the mother. If the mother brings too many young animals, it will be a little earlier to restore the mother's physical condition; if there are few, the mother is in good condition, and the relationship between the mother and the offspring is harmonious, you can score later. If the growth of the young is uneven and the breast milk is not very good, the young with strong physique, large body and strong feeding ability can be selected from the young, and the weak ones with poor physique can be left to the mother to continue to feed for a period of time, and then divided when the baby is strong. Generally speaking, when feeding, it is found that the relationship between the mother and the offspring is not harmonious, and if the mother attacks the offspring, they can divide their nests.

When nesting, all the young animals can be divided into two groups according to the male and female, and then the small ones in the male and female groups can be divided into separate groups, thus forming a large group of all male and female cubs, and the divided cubs can be raised in the same shed. However, the mother animal number should be recorded on the separate cage. in this way, it is convenient for breeders to add food reasonably according to the size characteristics of male and female animals, and to facilitate the primary selection of breeding animals.

The young animals who have just divided their nests are used to group life, and because the living environment has changed, they will feel uncomfortable with the new environment, and there is often stress, so they will scream from time to time; some of the young animals will inevitably be restless and their appetite will be greatly reduced. At this time, feed nutrition should be strengthened to make it adapt to the new environment and grow healthily. Due to the decline of physical condition due to the feeding of young animals, the mother should also strengthen nutrition so as to lay a good foundation for the next production. Although the offspring in separate nests are stressed by leaving their mother in the first few days, they have a poor appetite, but their appetite increases greatly after a few days. In order to make the offspring fully develop, the amount of feed should be continuously increased according to appetite, which can be fed three times a day. The nutritional level of foxes and minks is not less than 7.5 kilogrammes (100 kcal) per 418 kilojoules (100 kcal), and that of raccoons should not be less than 7.0 kilogrammes. According to the percentage of feed preparation, fox, mink animal feed should not be less than 50% 55%, raccoon dog should not be less than 45% 50%.

2 Technical essentials of primary selection

The primary selection of fox, raccoon dog and mink is carried out during weaning and littering.

2.1 Fox

The primary election is usually from May to June every year, and the male foxes with poor breeding ability and poor semen quality should be eliminated. The litter size of female foxes should be higher than the average of the whole group, and the development of young foxes with good motherhood, sufficient milk and lactation should be normal. The requirements for the primary foxes are as follows: clear pedigree, good production performance of their parents, early birth (silver fox born before April 10, blue fox born before May 20), normal growth and development, no disability, reserved for breeding. The number of seeds left in the primary election is 40% higher than that of the retention plan.

2.2 raccoon dogs

The primary will be held from May to June. After the breeding of adult male raccoon dogs, a primary selection was conducted according to their breeding ability, semen quality and recovery of body condition. After weaning, adult female raccoon dogs made a primary selection according to their reproduction, lactation and motherhood. When the young raccoon dogs were weaned, a primary selection was conducted for those with large size and good production performance of their parents according to the number of litters in the same litter and their growth and development. The number of raccoon dogs' primaries should be 35% and 40% more than the planned ones.

2.3 Marten

The primary is held before and after the young mink split their nests in June every year. Adult male mink: choose the ones with gentle temperament, strong mating ability, good semen quality, high birth rate and large number of offspring; adult female mink: choose those with normal estrus, smooth mating, short pregnancy period (less than 55 days), early birth, large number of offspring, sufficient milk, strong motherhood and high survival rate of offspring. Young marten: individuals with early birth, large number of litters in the same litter, normal development, high survival rate, clear pedigree and good quality of parents are selected for breeding. If all adult minks that meet the selection conditions are kept, the young minks should be 30% and 50% more than the planned number.