The timing of the initial allocation of sows
Gilt mating is too early or too late. Breeding too early will not only affect the number of first-born litters, but also affect the development of sows themselves and reduce their ability to reproduce their reproductive performance for a long time. Late-maturing will increase production costs. It also affects the amount of lactation after farrowing.
The initial allocation of gilts should be based on both sexual maturity and maturation. The occurrence of estrus in gilts does not mean sexual maturity. Tests have shown that cultivars and hybrid gilts have incomplete sex maturation before 8 months of age, have insufficient ovarian development, and have little ovulation. Even estrus should not be bred. According to the results of research and practice, cultivars and hybrid gilts should be bred at an early age of no earlier than 8 months and a body weight of no more than 100 kg; local breeds should be no earlier than 8 months of age, and no less than 75 kg is appropriate.
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