Seventeen antiserum identified by stormont method were used for investigation of appearance type of red blood cell in Cheju horse. Phenotype A₁, A´, Z, ZZ₂, C, K, P₁, Q, R, S, U₂, X and N₁ were classified by Hemolytic reaction and agglutination in E₂, H, J and T₁, Hokkaido horse and Thoroughbred horse were compared with the type of red blood cell. The results obtained are as follows ;
1. According to the appearance frequency of red blood cell the phenotypes could be classified by 6 groups among horses tested; I group : C, A₁, ZZ₂, E₂, S, Q, II : P₁, U₂, X, III : A´, R, IV : T₁, K, V : H, J, VI, N₁, Z.
2. In group I the type of C, A₁ and ZZ₂showed the Similar frequency among horses but the type of E₂, S and Q was lower in Cheju horse than Hokkaido and Thoroughbred horse.
3. In group II there was no differences in the type of P₁ and among three species, but Thoroughbred horse was lowest as 11.2 percent than Cheju and Hokkaido horse.
4. The type of U₂and X were highest in Cheju and Hokkaido horse but lowest in Thoroughbred horse.
5. The type of A´ and R observed higher appearance frequency in Hoklcaido horse but in the Thorough-bred and Cheju horse appearance ratio were Strikingly lowered.
6. The type of T₁and K was shown higher appearance frequency in Cheju and Thoroughbred horse similarly but lowered in Hokkaido horse.
7. In group V the type of H and J showed similarly as 30 to 40 percent in Cheju and Thoroughbred but no observation in Hokkaido horse.
8. The type of N₁ and Z which are group VI was great difference between Cheju and Hokkaido horse but higher in Hokkaido than Cheju horse while there was no observation in thoroughbred horse.
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