ERYTHROCYTE POTASSIUM AND SODIUM POLYMORPHISMS IN DONKEY (EQUUS-ASINUS)

1. Erythrocyte potassium polymorphism in donkeys (Equus asinus) is rep orted. 2. The erythrocyte K+/Na+ ratio is 6.51-13.6 in the high potass ium and 1.19-1.67 in the low potassium donkey subgroups. 3. There are some animals, however, that have intermediate K+/Na+ ratios of 2.21-3. 91 in addition to these two distinct subgroups. 4. The low potassium t ype erythrocytes appeared to be smaller than the high potassium type o nes. 5. Data supporting an incomplete recessive/dominant inheritance p attern of this erythrocyte potassium polymorphism is also provided.