75% of hybrid male and female breeding pigs with 75% wild boar ancestry were introduced. After raising, they were mated to 45 kg to 50 kg body weight. After 114 days of pregnancy, the pigs born still had 75% of their ancestry. This is called “expansionâ€. Traditional." According to this breeding, although the inbreeding is avoided, because its ancestor is a domestic pig (for example, the American Department, the Taiwanese Department of Duroc, etc.), from the biological point of view, it is inevitable that there is 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. Introduced 50% wild boar pedigrees, mother pigs or young sows, 75% wild boar filial pigs or young boars, rearing breeding breeding in the second estrus, the birth of the pigs wild boar bred can reach 62.5%. Breeding a pure wild boar and a hybrid female wild boar for breeding, production of wild boar pedigree accounted for 75% of the special wild boar. However, the cultivation of purebred wild boars should be started from small wild boars. Normal boars weighing 5 kg to 25 kg 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. Breeding purebred wild boar and wild boar bred 62.5% of the special boar sows breeding breeding, producing wild boar pedigree 81.2% of the special wild boar. Breeding pure boar wild boar and wild boar sows with 75% of wild boar pedigrees breeds, producing 87.5% of special wild boars with wild boar ancestry. Through the above four methods to purify and regenerate the progeny of the progeny pigs and reproduce them in the horizontal direction, large-scale production of extremely desirable special wild boar population can greatly improve the quality and purity of special wild boar, prevent degradation, increase market share, and provide humanity with Excellent animal protein. Recommended reading: http:// Calcium Gluconate Injection,Calcium Supplement Medicine,Calcium Gluconate,Calcium Gluconate Injection Calcium Supplement SHANDONG XINHUA PHARMACEUTICAL Co., Ltd. , https://www.sdxinhuapharm.com