Effect of β-lactoglobulin, κ-casein and αs1-casein polymorphic allelic variant on milk production traits in Croatian population of Holstein, Simmental and Brown cattle breed
Cilj ovoga rada bio je istražiti utjecaj polimorfnih varijanti β-laktoglobulina, κ-kazeina i αs1-kazeina na ukupnu proizvodnju mlijeka te prosječni udio mliječne masti i bjelančevina u mlijeku holstein, simentalske i smeđe pasmine goveda u Hrvatskoj tijekom prve tri laktacije. Premda su uočeni određeni utjecaji polimorfnih varijanti β-laktoglobulina, κ-kazeina i αs1-kazeina na visinu proizvodnje mlijeka istraženih pasmina goveda, razlike nisu bile značajne. Istraživanjem su utvrđeni utjecaji polimorfnih varijanti β-laktoglobulina, κ-kazeina i αs1-kazeina na prosječni udio mliječne masti u mlijeku istraženih pasmina goveda, no uočene razlike također nisu bile značajne. Utvrđene razlike u udjelu bjelančevina u kravljem mlijeku s različitim polimorfnim varijantama β-laktoglobulina, κ-kazeina i αs1-kazeina nisu bile značajne, osim u slučaju BC genotipa αs1-kazeina koji je pokazao pozitivan utjecaj (P<0,05) na udio bjelančevina u mlijeku krava holstein pasmine.The object of the present study was to analyse effect of polymorphic allelic variants of β-lactoglobulin, κ-casein and αs1-casein on total milk yield, fat and protein content in milk of Holstein, Simmental and Brown cattle breeds in Croatia during the first three standard lactations. Although the certain effects of polymorphic variants of β-lactoglobulin, κ-casein and αs1-casein on the level of milk yield in analyzed breeds of cattle are observed, those effects were not significant. The effect of polymorphic variants of β-lactoglobulin, κ-casein and αs1-casein on average fat content in milk of analyzed breeds has noticed, although differences were not significant. Differences in protein content in milk with different polymorphic variants of β-lactoglobulin, κ-casein and αs1-casein were not significant, except in case of BC genotype of αs1-casein, which was significant (P<0.05) on protein content in the milk of Holstein breed
