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.: Home > Animal Science Papers and Reports > 2003 > Volume 21 Number 2 > Ma³gorzata Szymanowska, Nina Strza³kowska, Eulalia Siadkowska, Jَzef Krzy؟ewski, Zofia Ryniewicz, Lech Zwierzchowski

Effects of polymorphism at 5’-noncoding regions (promoters) of لS1- and لS2-casein genes on selected milk production traits in Polish Black-and-White cows*

Ma³gorzata Szymanowska, Nina Strza³kowska, Eulalia Siadkowska, Jَzef Krzy؟ewski, Zofia Ryniewicz, Lech Zwierzchowski
Polish Academy of Sciences Institute of Genetics and Animal Breeding, Jastrzêbiec, 05-552 Wَlka Kosowska, Poland
Abstract :

The effects of cow’s genotype at لS1- and لS2-casein gene 5’-noncoding regions (promoters) were
determined on selected milk production traits of the 135 Polish Black-and-White (Polish Friesian)
cows as related to the animal’s age, lactation parity and stage, and somatic cell count. Cows of the AA genotype of لS1-casein gene yielded more milk daily than AG heterozygotes. Also, the daily yield of solids-non-fat, protein and lactose was higher in AA genotype cows. Milk of the cows with genotype CC of لS2-casein contained more lactose but less protein than that of the CT heterozygotes. The daily protein yield was slightly (but significantly) higher in the cows of the CT لS2-casein genotype. In summary, the results showed that genetic variants of لS1- and لS2-casein 5’-noncoding regions had only a slight effect on milk production traits of the Polish Black-and-White cows. Nevertheless, the AA genotype of لS1-casein seemed favourable for higher milk yield, as well as for lactose and protein content.

Keywords :
casein genes / cows / milk / polymorphism / promoter

Date Deposited : 12 Aug 2011 09:58

Last Modified : 12 Aug 2011 09:58

Official URL: http://www.ighz.edu.pl/

Volume 21, Number 2, - 2003

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