In production practice, the natural elimination rate of fertile sows is about 30%. Therefore, the rational breeding of gilts is crucial to guarantee the follow-up production. Especially before the low season of the pig-breeding market arrives, it is necessary to strengthen the breeding work, supplement the excellent gilts, and take the opportunity to renew the herds and improve the quality of the breeding herds. This will not only reduce losses during the low tide of the market, but also enable the gilts' offspring to catch up in the market's high tide.

Breeding gilts must consider the genetic basis of their parental fertility and give full play to their heterosis. Because the hybrid sows have the advantages of multiple ovulation, multiple births, significant primary births, and good milking power, it is best to use hybrid sows for domestic sows. Of course, the hybrid sows referred to here are not randomly hybridized and bred with hybrid pigs. Instead, they have plans to select offspring born after the crossing of a good paternal breed and an excellent female breed.

When breeding hybrid sows, it is best to select two breeds of hybrid sows, and then mate with the third fine breed of boar, which is called a three-way hybrid pig. Of course, not all three varieties of hybrid offspring are individuals with the best heterosis. Which three varieties are best suited to be combined together are determined through production practices. At present, where it is difficult to produce broiler pigs for crossbreeding, farmers can raise fine purebred sows in this area. Such sows are easy to raise, adapt to the local climate and feeding conditions, and people understand their characteristics. More, easy to raise. When breeding, select breeder boars of good quality and produce binary cross-breeding pigs as commercial hogs. If this cross-breeding pig has a good heterosis, pig farmers can select the best sow individual to be raised as a gilt, and then to breed a third-generation hybrid seed pig with the third fine breed boar; All three foreign hybrids can be selected for use as exotic hybrids. If the Duroc boar is a male parent, the hybrid sows selected by the hybrids of the Landrace boar and the White sow are mated for the female parent. The obtained Duchang second-generation hybrid pig is a Sanyuan pig. Such a three-way hybrid pig has the characteristics of high growth rate, high breeding pay, good reproductive performance, strong adaptability and disease resistance, good carcass quality, and high lean meat ratio, which can greatly improve the breeding efficiency.

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