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Title of the paper: Relations between genetic variants of κ-casein and ß-lactoglobulin and Performance ofBlack and White and Polish Red cattle Performance of 184 cows from 4 herds of Black and White (SR) and 178 cows from 4 herds of Polish Red breed(RP) was compared due to genotype encoding milk proteins: κ-casein and ß-lactoglobulin. Frequence ofinividual genotypes differend significantly both between herds within the breed. Statistically significantinfluence of genotype was found in relation to milk fat content in SR cattle (κ-CNAA> κ-CNBB and ß-LGBB >ß-LGAB > ß-LGAA) and in RP cattle milk protein yield (κ-CNBB > κ-CNAA) and fat content (ß-LGAA > ß-LGAB andß-LG ). The highest protein content and protein yield in milk was found in cows of both breeds carrying KCNBBgenotype (P>0.05). Significant relation with the age of first calving was stated in SR cows: κ-CNAA > KCNAB,in RP cows κ-CNBB > κ-CNAB and in SR cows ß-LGBB >ß-LGAB. Other traits such as longevity, life-timenumber of calvings and lactations, life-time yield were not found significantly related to searched genotypesalthough some trends were observed

archives animal breeding/archiv für tierzucht

Zusammenhang zwischen κ-Casein und ß-Lactoglobulin-Varianten mit der Milchleistung und der Nutzungsdauer von Rindern der Rassen Schwarzbuntes Rind und Polnisches Rotvieh