Further Studies on the Comparative Value of Butter Fat, Vegetable Oils, and Oleomargarines

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Abstract
With lactose as the sole carbohydrate in the diet, rats showed superior growth when fed butter fat or lard as compared to corn oil, coconut oil, cottonseed oil, soybean oil, peanut oil, olive oil and hydrogenated cottonseed oil. With a mixture of carbohydrates composed of sucrose, starch, dextrose, dextrin, and lactose in the diet, the average growth response of the animals fed vegetable oils was equal to that of the animals fed butter fat and lard. The growth rate on this ration was more rapid than when all of the carbohydrate was present as lactose. Properly fortified oleomargarine fats gave growth equal to butter fat over a period of 6 weeks when the above mixture of carbohydrates was incorporated in the rations. Properly fortified oleomargarines did not give growth equal to butter fat when lactose was the sole carbohydrate in the diet. On such a regime rats fed butter fat grew slightly better than rats fed oleomargarines of animal origin, but decidedly better than rats fed oleomargarines of vegetable origin.

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