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Two accurately grasp the maternal estrus, correct identification of estrus, timely mating in the estrus period sexual mating timely, when the mother can discharge more mature eggs, sperm and eggs meet and have more opportunities for fertilization, which can improve the conception rate and Birth rate.
Three times compounded to ensure the number of compounded, can reduce the empty rate to increase litter size because the follicular maturation is not the same period, timely increase in compounding can induce multiple ovulation, increase the number of ovulation, increase the number of births. Advocating multiple bus allocations can avoid the phenomenon of empty arms or small number of litters due to poor quality of semen as a result of a single bus allocation, thereby increasing fertility.
Balanced nutrition, so that the species has a good body condition. The pods are controlled from the winter period of wintering until the end of January and the beginning of February. The above conditions are good for the species, and the species is 6 to 7 kg before breeding and 5.5 to 6 kg for the female. To identify the body condition, a body mass index comparison method can be used. Body mass index equals body weight divided by body length centimeters. The ideal breeding condition is that the body weight of 1 cm body length is 100-115 grams, slightly higher in the cold regions of the north.
Fifthly, it is reasonable to use public funds to properly control the frequency of proper mating of public funds, ensure their nutritional needs, normal exercise and rest, and allow them to regain their energy in the short term, and maintain strong sexual desire and breeding ability. Pay attention to check the quality of semen and ensure the quality of mating.
Sixth, strengthen the domestication and increase the degree of domestication, and create favorable conditions for normal, smooth mating and calving, and increase fecundity.
Seventh, to strengthen the daily feeding and management to strengthen management, improve the quality of breeds, is to improve the basis of fecundity and protection.
The selection and retention of excellent species and the control of the age structure of herds shows that mothers of 2 to 4 years old have the highest fertility. Therefore, the age composition of the species should be dominated by the mating age, and the breeding calves supplemented every year at 25%. It is advisable that it should not exceed 50% at most. The useful life of the species is 4 to 5 years.