A comparison of fatty acid profiles and carcass characteristics of feedlot steers fed canola seed and sunflower seed meal supplements protected from metabolism in the rumen [cattle]
1993
Ashes, J.R. | Gulati, S.K. | Scott, T.W. (Commonwealth Scientific and Industrial Research Organisation, Blacktown (Australia). Div. of Animal Production) | Thompson, R.H. (Commonwealth Scientific and Industrial Research Organisation, Badgery's Creek (Australia). Div. of Animal Production) | Brown, G.H. (Commonwealth Scientific and Industrial Research Organisation, Blacktown (Australia). Biometrics Unit) | Rich, A.C. | Rich, J.C. (Rumentek Industries, Pty Ltd, SYdney (Australia))
The effect of feeding protected canola seed (PCS) and protected sunflower seed meal (PSM) supplements on the fatty acid profile and carcass characteristics of feedlot steers was examined. Fifty Hereford cross steers, average weight of 290 kg, were assigned to five groups of 10 and fed the following barley based concentrate rations for 133 days: 1, control (containing 15 percent untreated sunflower seed meal (SSM)); 2, PSM 15 percent,; 3, PCS 10 percent; 4, PSM 15 percent plus PCS 10 percent; 5, PSM 15 percent plus PCS 15 percent. The inclusion of PCS, with and without PSM, increased the proportion of C18 unsaturated fatty acids in the subcutaneous, perirenal and omental fats; there were threefold increases in the proportion of linoleic (18:2) acid, fivefold increases in linolenic (18:3) acid and smaller increases in the proportion of oleic acid (18:1). There was a 20-25 percent reduction in the proportion of palmitic acid, and the largest decrease was observed in the adipose tissue of steers receiving 15 percent PCS in the diet. Joint feeding of PCS and PSC significantly increased the dressing percentage of carcasses in groups 4 and 5 and fat depth in group 4.
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