Inbreeding
Inbreeding is the term utilized to describe breeding in which the
same ancestor appears two or more times within the first four
generations of pedigree. For example, if the same ancestor appears
in the third generation and again in the fourth, the horse is
referred to as being "inbred 3x4." The significance of inbreeding is
that the ancestor to whom the particular horse is inbred will have
greater influence, thus emphasizing certain characteristics. Most
believe it is radical for a horse to be inbred closer than 3x3.
Grand Slam is inbred to
Bold Ruler
4x4,
Native Dancer
4x5,
Nasrullah
5x5x5,
Princequillo
5x5, and
Tom Fool
5x5.
