Beta-lactoglobulin and kappa-casein polymorphism in relation to production traits and technological properties of milk in the herd of Polish Black-and-White cows
1994
Walawski, K. | Sowinski, G. | Czarnik, U. | Zabolewicz, T. (University of Agriculture and Technology, Olsztyn (Poland). Chair of Animal Genetics)
In a herd of cows of the same age kept under uniform environmental conditions, various beta-lg and kappa-cn genotypic groups was traced in the successive stages of lactation 1, 2 and 3. When considering the polymorphic beta-lg system it was found that a group of beta-lg BB homozygotes has a lower milk yield and lower milk acidity, coagulation and heat stability indices. The kappa-cn polymorphism manifested itself in a higher productivity of cows with AA kappa-cn and AB kappa-cn genotypes, a higher protein content in the milk of kappa-cn AB and kappa-cn BB cows as well as higher citric acid and phosphorus contents in the milk of cows with BB kappa-cn genotype
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