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Genetic parameter estimates for fatty acids in brisket adipose tissue of Canadian commercial crossbred beef steers

Ekine-Dzivenu, C., Chen, L., Vinsky, M.D., Aldai, N., Dugan, M.E.R, McAllister, T.A., Wang, Z., Okine, E.K., and Li, C. (2013 in press). "Genetic parameter estimates for fatty acids in brisket adipose tissue of Canadian commercial crossbred beef steers.", Meat Science.

Abstract

Heritability, genetic and phenotypic correlations between 15 individual and 10 groups of fatty acids with a concentration greater than 0.5% in the brisket adipose tissue of 223 Angus and Charolais based crossbred commercial steers were estimated using univariate and bivariate animal models. Individual saturated fatty acids were low to moderately heritable, with heritability estimates ranging from 0.05 (C16:0) to 0.31 (C15:0). Individual monounsaturated fatty acids were low to moderately highly heritable ranging from 0.04 (9c C17:1) to 0.51 (9c C14:1). Polyunsaturated fatty acid C18:2n-6 was moderately heritable (0.17). Among groups of fatty acids, heritability estimates ranged from 0.03 for branched chain fatty acid (BCFA) and n-6/n-3 to 0.16 for n-6 and Health Index. A range of low (0.00) to high (1.00) phenotypic and genetic correlations was observed among the 25 fatty acids considered in this study. In general, fatty acids such as conjugated linoleic acid (CLA) and 11t C18:1, with potential health benefits, showed significant antagonistic correlations with unhealthy fatty acids such as C14:0 and C16:0. The results from this study provide insight into the direct genetic control of host genes on fatty acids composition of beef tissues and will facilitate designs of genetic selection and/or genetic based diet management to improve fatty acid composition in beef cattle

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