It is advisable to use one year or four years for overage and no years of breeding. The female breeding rate was 79.6%, 93.7%, 100%, 100%, and 70% from 1 to 5 years of age, respectively, and the rate of pregnancy from maternal 1 to 5 years old was 78.7%. , 88.7%, 96.1%, 95%, 76%. Therefore, the species must not exceed 4 years old.
Poorly shaped, insubstantial, malformed, incomplete or suffering from self-bite and chronic diseases, can not be left for planting.
Low fertility does not leave no more than 4 first-mothers of normal females, and high-yield females with no less than 6 females from 4 to 5 years of age have to be eliminated. Each year, breeding stocks should be mated with more than 4 females, and the number of breedings should be more than 10 times. Otherwise, they should be adjusted.
Plush discoloration does not leave color, luster, density, hair length and distribution uniformity as the key to identifying the superiority of the species. Such as dark brown species of male boar plush brown or light brown, the density is sparse, uneven distribution, length is too long, uneven, vice needle hair more, can not be reserved for species use.
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