Experience of breeding nutria in breeding

It is generally selected from adult mice aged from 6 to 7 months to 3 years old. The breeding work should be carried out all the year round, and the quality of the breeding rodents should be identified from the end of November to the middle of January. Seed selection is based on body size, body weight, body condition, plush quality, color, fecundity, progeny quality and so on. Because the nutria skin is used to remove needle hair, the quality of the quilt is based on plush. Good breeding mice should have uniform and bright plush, and the density and length of villi on back and abdomen (above 20mm) should be similar. Brown and dark gray are the best colors. Eliminate those individuals whose quilt quality is poor and the color does not meet the requirements. Broad abdominal circumference, strong physique, strong limbs, strong adaptability, strong appetite, no more than 4 years old, healthy and disease-free can be reserved for seed use. The mother rat should have a high conception rate, 6-8 babies, strong lactation, good motherhood, more than 4 pairs of nipples, more than 2 babies a year, strong sexual desire, weight above 4~4.5kg, and a clear pedigree. The mother rats with less litter, easy miscarriage, less lactation, dystocia and easy to get pregnant are eliminated. Male rats should have strong sexual desire, gentle temperament, wide head, straight waist and back, strong limbs, and female rats with high fecundity and weight above 4.5~5kg. The male rats that can not conceive the female, have low breeding ability, have a weak physique or become sick are eliminated in time. The health of the mother should be taken into account in replenishing the young mice, and the offspring of the mother mice in poor condition should not be spawned. The young mice are not mature at the age of 4 ~ 5 months, so they should be selected at the age of 6 ~ 7 months. At this time, the weight of female mice should not be lower than that of 3.5kg, the weight of male mice should not be less than 4 females, the coat should be dense and shiny, and the length should not be less than lOmm.