The most integral portion of any breeding program is the Pedigree. Programs for line-breeding and inbreeding are firmly imbedded in the importance of pedigrees. Even outcross programs staunchly rely on the pedigree of a breeding to tell the breeder whether each mating is actually an outcross or not. Pedigrees are the basis of all breeding programs. Several good all breed references for study and research of various breeding systems and methods are available, and some are included in the bibliography of this article.