First, a generation of male and female hybrid male pigs with 50% of wild boar ancestry were introduced. After growing up, they were mated. After 114 days of gestation, the number of wild pigs born is still 50%. This is called “expansionâ€. According to this breeding, despite the avoidance of inbreeding, but because of its ancestors home pig is used as a female parent (such as the United States Department, the Department of Duroc, etc.), from the biological point of view, there will be a return to the ancestral phenomenon With a long expansion time, the wild boar gene (blood line) is inevitably reduced. For this reason, the following measures can be taken to avoid degradation and increase the purity of special wild boars.
1. Introduce 50% of wild boar gilts or young sows and 75% of wild boar broilers or young boars. Breed and breed in the second estrus period after breeding. It can reach 62.5%.
Second, breeding purebred wild boars and one-generation hybrid female wild boar breeding breeding wild boar bred 75% of wild boar. Breeding of purebred wild boars should be started from a small age. Normal wild boars weighing 5-25 kilograms are generally selected for domestication and rearing.
Third, let purebred boar and wild boar bred 62.5% of the special wild boar breeding breeding, breeding wild boar 81.2% of the special wild boar.
4. Purebred wild boars and wild sows, which account for 75% of wild boar pedigrees, are bred to breed 87.5% of wild boars.
Through the above four methods to purify and regenerate the progeny of the progeny pigs and then cross-mating and breeding, and increase populations, the quality and purity of special wild boars can be greatly improved, and degradation can be prevented.
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