Abstract
In recent years, fatty acid composition has attracted attention as a new trait for evaluation of beef quality. Although there are a lot of information given, mainly in marbling in Japanese Shorthorn red meat, there are few reports on fatty acid composition. Therefore, the effect each genotype polymorphism SCD, FASN, SREBP-1 and GH is given to the fatty acid ratio and carcass traits in 279 Japanese Shorthorn head were analyzed using mixed-inheritance animal model. Heritability of fatty acid ratio was 0.39-0.51, C18:2 had the lowest which was similar to the report on Japanese Black Cattle. Both FASN and SCD were effective in C14:0 and C14:1, FASN was effective in C16:1 and C18:1, SCD was effective in C18:0, C18:2, SFA and MUFA. On the other hand, effect of GH was not observed. SREBP-1 polymorphism could not be confirmed. It was suggested that the genetic influence on fatty acid composition was strong, and genotype information of FASN and SCD were useful as markers in Japanese Shorthorn.
