Unrelated crossbreeding, or outbreeding (from the English, out – outside and breeding – breeding), is the crossbreeding of unrelated individuals of the same species, i.e., having no common ancestors in the next 4-6 generations. Due to the fact that with a decrease in the degree of kinship between crossed organisms, the likelihood of having different gene alleles increases, outbreeding is used to increase or maintain a certain degree of heterozygosity of individuals. In many respects, including economically valuable ones, heterozygotes often surpass homozygous ones. Harmful recessive mutations in this case turn into a heterozygous state, which contributes to an increase in the viability and productivity of the offspring. For example, by breeding pigs of the breed Large White, bred in England in the 19th century, with other breeds, offspring are distinguished by high viability and good adaptability to environmental conditions.
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