I work with a practically extinct breed of dog and our struggle is that there is so few of the breed that there is not enough genetic diversity. We avoid inbreeding/line breeding as much as possible to try to build diversity. Unfortunately, generation after generation, breedings begin to bottle neck and you end up crossing lines. In dogs, inbreeding once won't nessesarily cause an issue but multiple line breedings will make genetically weak dogs. I'm new to reptile genetics and many veteran BP breeders have said that it does not have any effect so I would listen to them. For my projects, I am going to attempt to reach my goal without any line breeding because Id like to believe, like dogs, outcrossing lines equals a more genetically solid animal. Of course those are just my practices so I'd recommend you listen to the more experienced reptile keepers
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