Ryan, Old Hand promoted standard Mendel's Theory line breeding. The theory still holds true. He also stated that close inbreeding could not be regarded as being close until that type of mating had continued for four generations. The most important factor in any breeding, but especially with all forms of line breeding, is to test the outcomes. The closer you breed, the stricter your culling has to be. Line / in breeding magnify the good points and allow a better prediction of outcome, but with all positives come a negative. It also magnifies the bad points, thus the need for stricter control.