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To control the hereditary deficiency of red cell band 3 with spherocytosis inherited by an autosomal incomplete dominant mode in Japanese black cattle the dams were mated with assumptive non-carrier bulls. The dam genotypes were determined by the osmotic fragility of red cells and their offsprings, while the sire genotypes were supposed based on the previous production of affected offsprings. The definitive genotypes were determined by the causal DNA mutation. Out of 12 calves produced by mating of heterozygous parents before controlling, two were affceted. After the genetic control however, there was no affected case in 9 calves produced. The gene frequencies were 54% and 22% before and after the control, respectively.

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