Distribution of alleles of the alphas-casein complex was studied by isoelectric focusing in the White Shorthaired Polled goat according to the method of Krause et al. (1988) and Mahé et al. (1993). In addition to the common alleles alpha s1-CnA and B, the alpha s1-CnE allele is described; it has not yet been observed in this breed. We are not able to confirm the occurrence of the alpha s1-CnC allele. At least one out of three defective mutants (alpha s1-CnD,F and 0) was found, nevertheless their identification was not discussed. The following percentile occurrence (Tab. I) of the above-mentioned alleles of alpha s1-casein was determined: alpha s1-CnA = 11.30; alpha s1-CnB = 38.26; alpha s1-CnC = 0; alpha s1-CnE = 17.39; alpha s1-CnX = 33.04 (the letter X indicates the defective mutants without specifying their type and number). Our results differ significantly from those of Boulamger et al. (1984), Grosclaude et al. (1987) and Trakovická (1992). Higher (in contrast to the French authors) and lower alpha s1-casein allele rates (as compared to Trakovická, 1992) were observed. The higher occurrence of the alpha s2-CnB is also conspicuous. However, our observations correspond to those according to which the "strong" alleles have higher frequencies in European breeds than in the French ones (Grosclaude et al., 1992-cit. Mahé et al., 1993). The alleles of alpha s2-casein were also investigated. The electrophoretic variant of the alpha s2-casein was observed next to the type B and located closer to the anode (suspected mutation); on that account it was named B-. This variant was also seen in a homozygous form.(ABSTRACT TRUNCATED AT 250 WORDS)

Ustav experimentálnej veterinárnej medicíny Kosice