Effect of Pasture and Lipid Supplementation on Production Performance, Carcass Quality, Fatty Acid Composition and Lipid Metabolism of Lamb
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The significance of diet during the growing and finishing of lambs on production and lipid metabolism was studied. Thirty-two intact 5-6 month old Suffolk cross ram lambs that had previously grazed either red clover (RC) or tall fescue (TF) were finished on a concentrate diet containing isolipidic supplements of either fish oil (FO), soybean oil (SBO) or a 30:70 mixture of CLA isomers and SBO (CLA+). When compared to TF, RC increased carcass weight (1.1-fold) and content of muscle ALA, subcutaneous adipose ALA and total PUFA (1.2-fold), and decreased D9D expression in liver (1.6-fold). FO decreased carcass weight (1.1-fold) and increased muscle and subcutaneous adipose EPA (5.6- and 10.8-fold), DHA (5.8- and 13-fold) and total PUFA (1.4- and 1.2-fold) while decreasing SREBP (1.6-fold) expression in liver and SPOT14 and leptin expression in enteric adipose. CLA+ increased subcutaneous adipose CLA isomers (1.8-fold) with no effect on carcass weight or gene expression.