Rats were fed PER diets containing various proportions of cis and tram fatty acids as triolein, trielaidin, soybean oil (SO) or hydrogenated SO at 7.8% by weight of the diet. Additional rats were fed SO or hydrogenated SO at 20.1% of the diet. The PER, although in the normal range for casein, was significantly (P < 0.01) lower in rats fed trielaidin. Food consumption and weight gains were slightly greater in truns-fed than cis-fed rats. The former had greater fecal fat excretion than the latter; serum cholesterol levels of the former were lower with the 7.8% but not the 20.1% fat diet.
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