The catalase phenotypes and the gene frequencies in erythrocyte of 223 Cheju native horses were studied by starch gel electrophoresis. The results obtained were as follows:
1. In the catalase phenotypes, three phenotypes, CatF, CatM and CatS, which were controlled by two allelic genes, Cat^F and Cat^s, were observed and their frequencies of appearance were 24.21%, 47.53%, and 28.25% respectively.
2. The distribution of gene frequency was calculated as 0.480 in Cat^F and 0.520 in Cat^S.
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