INFLUENCE OF CSN3 MARKER ON MILK COMPOSITION IN ROMANIAN BROWN AND ROMANIAN SIMMENTAL CATTLE FROM S.C.D.C.B. ARAD

Abstract

Milk yield and composition in cattle are typical quantitative traitswhich are influenced by environmental factors and allelic variations. K-casein is a protein expressed in milk and, due to is polymorphism, may serve as a molecular marker for yield, composition and technological properties of milk. The objective of this study was to compare the relation between the genetic marker CSN3 (k-casein) and the observed milk traits in selected cattle groups. In our study we analyzed the milk traits of 32 Romanian Brown dairy cows and 54 Romanian Simmental dairy cows. The experiments described in this paper show clear evidence that -CSN3 genotype is involved in milk protein enrichment. The CSN3 gene of BB genotype showed a grate influence on protein yield. The relation between CSN3 genotype and milk protein was found to be significant in both cattle breed.

Keywords

• milk protein
• k-casein
• genotypes frequencies