Związek polimorfizmu kappa-kazeiny (cask) z wydajnością i składem mleka krów rasy polskiej holsztyńsko-fryzyjskiej odmiany czarno-białej
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The study involved 859 Polish Holstein-Fresian var. Black-and-White cows. The kappa-casein (CASK) genotypes were determined using PCR (Polymerase Chain Reaction) method. It was found that allele of CASKA had occurred more frequently than allele of CASKB in all analyzed lactations of Polish Holstein-Fresian cows. It was also found that cows with the CASK AA genotype had a higher milk yield than cows with CASK BB genotype. The differences were significant (P ≤ 0.01) in the second lactation. The highest milk protein content and fat content for the three analyzed lactations were recorded for the CASK BB genotype. The differences were significient (P ≤ 0.01, P ≤ 0.05) in the second lactation and the third lactations. Milk with a higher contents protein in cows with CASK BB genotype is a better material in technological usefulness.
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