higher fillial generations denote the concentration of genes to those that are prefered for that trait.

This occurs in Hypos, Pastels, and Harlequin boas. Within reason, most breeders won't pass F4 without adding some new blood. Line breeding can isolate specific traits, as was done with Pastels. Pastels have the advantage of multiple bloodlines to eliminate the need to inbreed to achieve the desired results.

In locale specific, and other rare pure stock the generation number is important to know how close they are to the original animals.

Some species/subspecies/locales are introduced to captivity with one pair, or maybe two. The longer that P and F1 generations can be maintained the better to build a strong diverse group in captivity.

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