engleski

Does the selection on SS-casein affect the traits important for dairy production of Slovenian Brown Swiss cattle?

The purpose of this study was to determine the impact of genomic selection on A2A2 ß-casein genotype in Brown Swiss cattle on important dairy production traits – traits included in total merit index (TMI). A total of 190 Slovenian Brown Swiss cattle, 83 females and 107 males, with known direct genomic values (DGV) from InterGenomics project and known genotype for ß-casein were used for estimation of the genotype effect. The determined genotype frequencies in population were 2.63 % for A1A1, 35.26 % for A1A2 and 62.11 % for A2A2 genotype. For DGV data analysis a single–trait model was used, considering genotype for ß-casein as fixed effect. Analysis showed significant differences between genotypes for ß-casein for three dairy production traits –TMI for dual purpose, pasterns and rear teat position. Our research indicates that selection on A2A2 ß- casein genotype would not have implications for traits important for dairy production.

genomic selection; ß-casein; Brown Swiss; dairy production; A2

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