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.: Home > Animal Science Papers and Reports > 2005 > Volume 23 Number 3 > Nina Strza³kowska, Eulalia Siadkowska, Krzysztof S³oniewski, Jَzef Krzy؟ewski, Lech Zwierzchowski

Effect of the DGAT1 gene polymorphism on milk production traits in Black-and-White (Friesian) cows

Nina Strza³kowska, Eulalia Siadkowska, Krzysztof S³oniewski, Jَzef Krzy؟ewski, Lech Zwierzchowski
Polih Academy of Sciences Institute of Genetics and Animal Breeding, Jastrzêbiec, 05-552 Wَlka Kosowska, Poland
Abstract :

The effect was studied of the lysine/alanine (K232A) diallelic polymorphism in acylCoA-diacylglycerol- acyltransferase 1 (DGAT1) on milk production traits in a sample of Polish-Black-and-White (Friesian) cows. The considered polymorphism results from AAپ¨GC nucleotide substitution in DGAT1 gene exon 8. Genotyped were 177 cows out of which 86 were included in the association study. The DGAT1 genotype showed no significant effect on the daily milk yield. Moreover, no differences were found between genotypes in daily yield of  fat-corrected-milk (FCM) and mean daily value-corrected milk (VCM). The cows of DGAT1 genotype AA/GC yielded milk with significantly higher fat and total protein content than those of GC/GC genotype. Moreover, the AA/GC cows produced milk with higher total solids and solids-non-fat content. The total milk protein to milk fat ratio in AA/GC cows was 0.79, while 0.83 in GC/GC cows. No significant differences were found between genotypes in the weight of milk components produced daily. The study showed some associations occurring between genetic variants at the coding region of the bovine DGAT1 gene and milk production traits of Polish Blackand- White (Friesian) cattle; in particular the AA allele (coding for lysine) appeared favourable for fat and protein content of milk.

Keywords :
cattle /gene DGAT1 / gene polymorphism / milk production traits

Date Deposited : 09 Aug 2011 11:33

Last Modified : 09 Aug 2011 11:33

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

Volume 23, Number 3, - 2005

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