Abnormal segregation of alkaline ribonuclease genes in cattle1

Polymorphism of alkaline ribonuclease in the leucocytes of 76 bulls, 554 cows and their progeny of 556 calves was investigated. All possible genotype matings were examined. Observed offspring genotypes were compared with the expected ratios. Abnormal genotype distribution was noticed: homozygous calves of RNase^B/RNase^B genotype were significantly fewer than expected.