Articles | Volume 44, issue 3
10 Oct 2001
 | 10 Oct 2001

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

J. Juszczak, G. Erhardt, M. Kuczaj, R. Zieminski, and L. Panicke

Abstract. Title of the paper: Relations between genetic variants of κ-casein and ß-lactoglobulin and Performance of Black 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 of inividual genotypes differend significantly both between herds within the breed. Statistically significant influence 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 and ß-LG ). The highest protein content and protein yield in milk was found in cows of both breeds carrying KCNBB genotype (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-time number of calvings and lactations, life-time yield were not found significantly related to searched genotypes although some trends were observed.