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Further Studies on the Comparative Value of Butter Fat, Vegetable Oils, and Oleomargarines¹

Department of Biochemistry, College of Agriculture, University of Wisconsin, Madison

1. 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.

2. 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.

3. 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.

4. 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.

This work was supported in part by grants from the Evaporated Milk Association, Chicago; the National Dairy Council, Chicago; and the Wisconsin Alumni Research Foundation. We are indebted to Merck and Co., Rahway, New Jersey, for supplies of thiamine, riboflavin, pyridoxine, calcium pantothenate, and choline; and to Winthrop Chemical Company, New York, for crystallien vitamin D₂.

Manuscript received 19 July 1943.