Originally posted by hawker238
Please cite a scientific source from which you drew this conclusion....
Mostly it comes from being around people real, real serious about producing superior Labrador retriever lines. In short, the real world.
However, entertain yourself by putting "linebreeding dangers" in Google and you'll get stuff like this:
Geneticists and livestock breeders use the term "linebreeding" to refer to any mating program (even closer than four generations) that repeats lines to a specific, presumably superior, ancestor.
This is done in the hopes of increasing the chances of that ancestor's superior genes coming down to the resulting offspring. This is the purpose of linebreeding, to increase the potential for inheriting superior gene combinations.
These same experts know that using this breeding method with closely related individuals (i.e., inbreeding and closebreeding) is a very risky business because while it may increase the possibility of inheriting superior genes, it also increases the possibility of inheriting any hidden, possibly negative recessive characteristics that may go along with this ancestor's genotype.
In short, I'm foregoing citing you sources because it's considered common knowledge.
