Genetic Polymorphism of Milk Proteins in Hungarian Spotted and Hungarian Grey Cattle: A Possible New Genetic Variant of β-Lactoglobulin

Abstract

Genetic variants of αs1-, β-, and κ-caseins and of β-lactoglobulin were studied with PAGE and isoelectric focusing in milk samples of 101 Hungarian Spotted and 120 Hungarian Grey cows. Gene frequencies and genotypic frequencies were estimated. Significant differences in gene frequencies between the two breeds were observed at the κ-casein and β-lactoglobulin locus. The variants β-casein C, κ-casein C, and β-lactoglobulin D were not found in Hungarian Grey cows. On immobilized pH gradient, isoelectric focusing gels containing carrier ampholytes, a new unidentified protein band appeared near β-lactoglobulin B in about 10% of the milk samples of Hungarian Grey cattle. © 1993, American Dairy Science Association. All rights reserved.