75% of hybrid male and female breeding pigs with the wild boar pedigree were introduced. After growing up (up to 45-50 kg body weight) for breeding, the piglets born after 114 days of pregnancy are still 75% of their ancestry. This is called “expansionâ€. . According to this breeding, despite avoiding inbreeding, but because of its ancestors are home pigs as mothers (such as the US Department, the Department of Duroc, etc.), from the biological point of view, inevitably have returned Phenomenon, long expansion time, boar gene (blood) will inevitably reduce. To do this, take the following measures to avoid degradation and increase the purity of special wild boars:
1. Introduce 50% of wild boar gilts or young sows, 75% wild boar gilts or young boars, breed after breeding in the second estrus, pigs born can reach 62.5% of wild boar ancestry .
2. Breed pure wild boars and breed hybrid female wild boars for breeding, producing wild boars that account for 75% of wild boar ancestry. However, the cultivation of purebred wild boars should be started from small wild boars. Normal wild boars weighing 5-25 kilograms are generally selected for domestication and rearing. Otherwise, the body weight is too large, the wild is difficult to change, the plasticity is poor, the breeder is inconvenient to approach it, and it is not convenient for the breeding operation.
3. Breeding pure boar wild boar and wild boar sow of 62.5% of the special sow sow breeding, production of wild boar pedigree accounted for 81.2% of the special wild boar.
4. Breeding and breeding of pure wild boar sows and wild boar sows with a proportion of 75% of wild boar bred to produce 87.5% of special wild boar with wild boar ancestry.
Through the above four methods to purify and regenerate the progeny of future generations of litters, the large-scale production of special wild boar populations can greatly improve the quality and purity of special wild boars, prevent degradation, increase market share, and provide excellent humans The animal protein.
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