Dietary canola seeds alter the fatty acid composition of bovine subcutaneous adipose tissue
1989
Rule, D.C. | Wu, W.H. | Busboom, J.R. | Hinds, F.C. | Kercher, C.J.
Consumption by humans of high-oleate lipids lowers plasma total cholesterol and low density lipoprotein cholesterol; therefore, increasing the proportion of oleic acid in lipids of beef may improve its nutritional quality. Sixty-three steers were fed diets containing corn silage, barley and supplemented with either soybean meal (SBM), canola meal (CM) or canola seeds (CS) (a high oleic, low erucic acid rape seed) to compare growth, feed intake and fatty acid composition of adipose tissue. Three reps of seven steers each (initial weight 304.7 kg) were fed each diet for 94 d. Canola seed lipid contained 64% 18:1, 17.6% 18:2, 6.4% 18:3, 4.2% 16:0 and 2.2% 18:0, and contributed .59 kg/d of lipid intake to steers receiving the CS diet. Total lipid intakes were .78 and .24 kg/d for steers fed CS and both SBM and CM diets, respectively. Average daily gain and daily feed intakes were similar for steers fed SBM (1.1 and 7.9 kg) and CM (1.2 and 7.8 kg), which were greater (P< .05) than CS-fed steers (1.0 and 6.9 kg). Feed : gain were similar for all groups. No differences in fatty acid contents or proportions were observed in biopsies of subcutaneous adipose tissue from steers fed the SBM and CM diets. Compared with adipose tissue of steers fed the SBM diet, CS-fed steers had (P < .05) less 15:0, 16:0 and 16:1, and more 18:0, 18:3, 20:0 and 20:1.
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