Abstract
Ozdemir, M. and Dogru, U. 2004. Relationships between alfa-casein polymorphism and production traits in Brown Swiss and Holstein. J. Appl. Anim. Res., 25: 5–8. To study the effect of αs1-Cn polymorphism on milk production traits, milk samples from Brown Swiss, Holstein and East Anatolian Red cows were analyzed for αs1-Cn BB and BC types using horizontal starch-gel electrophoresis method. Proportion of αs1-Cn BB and αs1-Cn BC in terms of αs1-Cn phenotype were 74.3% and 25.7%, respectively. No significant differences were found among breeds in frequencies of αs1-Cn phenotype. Although the effects of αs1-Cn phenotypes on milk yield, milk fat yield and 305-days milk yield in Holstein cows were found to be significant (P<0.05), no effect on these traits in Brown Swiss and lactation period, 305-days fat yield and fat percentage in both the breeds were observed.
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