for proveing genetics, or isolateing certain traits. Once the desired result is obtained which usually takes no more than 4 generations, outbreeding is needed to strengthen the variety of genes that might otherwise lead to health problems/deformaties.

In the case of RARE animals were only one or two pairs are initially brought in it is EXTREMELY important to know what the filial generation is so that they can be responsibly bred to maintain a diverse gene pool. (ie: when working with F1, whose parents were the only other breeding animals, breed F1 offspring that are as different as possible together)

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