Polymorphism of alkaline ribonuclease in the leucocytes of Black-and-White cattle

Studies were carried out on the polymorphism of alkaline ribonuclease in Black-and-White cattle in the north-eastern region of Poland. Leucocytes isolated from peripheral blood were used. Three phenotypes were defined, consisting of the combination of two alleles. The gene frequency was: q⁴= 0,7082, q^B= 0,2918. In calves the frequency of allele RNA-ase^B and number of RNA-ase^A/ RNA -ase^B heterozygotes were higher than in adult animals.