Abstract
Acyl-CoA:diacylglycerol acyltransferase-1 (DGAT-1) is a key enzyme involved in triglyceride synthesis. DGAT-1 gene is located in the centromeric region of the bovine chromosome (BTA) 14 and considered polymorphism was identified as a candidate gene for milk and meat QTL. One of mutations which is substitution AA → GC in exon 8 causes an amino acid change in the product. The effect of the lysine/alanine (K232A) diallelic polymorphism on meat production traits has been studied. 156 young Black-and-White (Friesian) bulls were genotyped. The association between diacylglycerol acyltransferase polymorphism and slaughter performance and meat technology analysis were examined. Moreover the fatty acid profile (C12–C20:5) including CLA in the sample of longissimus dorsi (LD) muscle was evaluated. Differences (P ≤ 0,05) were found between genotypes in slaughtering performance traits as well as fat and valuable cuts content and meat-fat ratio. The significant difference occurred also in the water holding capacity. Heterozygous individuals AA:GC were characterized by the greatest values compared with homozygous ones. Bulls of DGAT-1 genotype GC:GC showed significantly higher (P ≤ 0,05) content of lauric acid in LD muscle and heterozygous animals differ in CLA content with homozygous AA:AA.
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