Effect of DNA polymorphisms related to fatty acid composition in adipose tissue of Holstein cattle.

Fatty acid composition of adipose tissue has been recognized as an important carcass trait because of its relationship with eating quality such as favorable beef flavor and tenderness. Therefore, we investigated the effects of genetic polymorphisms of liver X receptor, alpha (LXR), stearoyl-CoA desaturase (SCD), Fatty acid synthase (FASN), and Fatty acid binding protein 4 (FABP4) on fatty acid composition in intramuscular fat tissue of Holstein steers. The major allele frequencies were 0.705 in SCD, 0.518 in FABP4, 0.888 in FASN, and 0.984 in LXR. Genotyping of SCD showed significant effect on C14:0, C14:1, C18:0 and saturated fatty acid (P < 0.05). In addition, the result suggested that SCD genotype possibly had effect on composition of C18:1 and monounsaturated fatty acid. Genotype of FABP4 had significant effect on composition of C16:0. Effect of LXR genotypes could not be analyze because of extremely biased genotype frequencies. Our results suggest that genotypes of SCD and FABP4 may in part affect meat quality in Holstein.

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