Scrapie is a fatal, infectious neurodegenerative prion disease that affects sheep and goats. Natural mutations in the prion protein gene of sheep and goats have been identified which confer susceptibility or resistance to scrapie.
White spotting patterns occur in many donkey breeds and are similar to those of horses in that the amount of white can range from a few white hairs to an animal that is almost completely white. Two variants have been identified in donkeys that contribute to white patterning (W and Wˢ).
The AB system is the major blood group system in domestic cats. The common blood types are A and B, and a third rare type "AB" is also known. This test detects the known genetic variants that produce B and AB blood types. When these variants are not detected, the cat is likely to have blood type A.
Pre-implantation genetic diagnosis (PGD) is a procedure used to screen embryos recovered after uterine flush to determine sex and genetic traits through DNA testing prior to implantation in the uterus.
Roan is a white patterning coat color trait characterized by intermixed white and colored hairs in the body while the head, lower legs, mane, and tail remain colored.