We inbreed in order to retain desirable traits while attempting to generate animals homozygous for these traits. Note, however, that resistance to disease, fertility and size are reduced in inbred animals. Therefore, we must be especially selective and take care that only healthy birds are used for breeding. After all, vitality, endurance and the desire to fly are the mainstays of the sport.
Taken from Pigeon Racing Today & Tomorrow
by J.W.E. Stam, D.V.M, Ph.D.
