The protein composition and technological traits were investigated in Simentaler milk with genetic variants A or B of ß-lactoglobulin (ß-LG). Data were included from 78 cows from 3 dairy farms. Genotypes of ß-LG were determined by applying horizontal starch-gel electrophoresis with addition of urea and mercaptoethanol. In addition, fat, crude protein (CP), true protein (TP), casein (CN), whey protein (WP), non-protein nitrogen (NPN), lactose and calcium (Ca) content, casein number (CNno) and rennetability of milk from Slimental breed were examinated. The method of last squares means using the general linear model (GLM) was used for statistical analysis of data. The model included heard and genotypes of ß-LG as fixed effects. The genotypes of ß-LG had no significant association with fat, CP and TP content, while CN and WP content and CNno were significantly affected by the genotypes of ß-LG. The BB genotype of ß-LG was significantly associated with higher CN content and CNno. The positive effect of the allele B of ß-LG on rennetability was found out.
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