Estimates of genetic parameters for triacylglycerol fatty acids in beef cattle at weaning and slaughter

Malau-Aduli, A.E.O., Edriss, M.A, Siebert, B.D., Bottema, C.D.K., Deland, M.P.B., and Pitchford, W.S. (2000) Estimates of genetic parameters for triacylglycerol fatty acids in beef cattle at weaning and slaughter. Journal of Animal Physiology and Animal Nutrition, 83 (4-5). pp. 169-180.

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Adipose tissues from the 12th–13th rib interface were sampled at weaning (324 cattle) and slaughter (310 cattle). The animals were progeny from Hereford dams sired by Angus, Belgian Blue, Hereford, Jersey, Limousin, South Devon and Wagyu. Fatty acid composition of the triacylglycerol fraction at both stages was measured by gas-liquid chromatography. Estimates of heritability and genetic and phenotypic correlations at weaning and slaughter were computed by restricted maximum likelihood using a sire model in both univariate and multivariate analyses. Results indicated that generally, there were strong, positive genetic correlations between fatty acids at weaning and slaughter (as high as 0.98). Phenotypic correlations were however, low and poor (0.04–0.44). Heritability (h2) estimates at weaning were low to moderate, ranging from 0–0.31. However, at slaughter, h2 estimates were generally higher than at weaning: Stearate, oleate and total monounsaturates had h2 estimates of 0.43, 0.37 and 0.40, respectively. Other carcass traits such as marbling score and melting point of fat had h2 estimates of 0.20 and 0.52, respectively. Significant breed, sex and location differences in fatty acid composition were also observed at weaning and slaughter.

Item ID: 41064
Item Type: Article (Research - C1)
ISSN: 1439-0396
Funders: J. S. Davies Bequest Fund, South Australian Cattle Compensation Trust Fund, Australian Development Scholarship, AusAID
Date Deposited: 26 Nov 2015 03:25
FoR Codes: 06 BIOLOGICAL SCIENCES > 0604 Genetics > 060412 Quantitative Genetics (incl Disease and Trait Mapping Genetics) @ 50%
07 AGRICULTURAL AND VETERINARY SCIENCES > 0702 Animal Production > 070201 Animal Breeding @ 50%
SEO Codes: 83 ANIMAL PRODUCTION AND ANIMAL PRIMARY PRODUCTS > 8303 Livestock Raising > 830301 Beef Cattle @ 100%
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