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Further Studies on the Growth-Promoting Value of Butter Fat^*

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

ABSTRACT

1. Rats showed superior growth on butter fat as compared to corn oil when the sole carbohydrate in the diet was lactose. When the sole carbohydrate was dextrose, sucrose, dextrin, or starch the superiority of butter fat disappeared and corn oil gave rates of growth comparable or even slightly better than butter fat. The possible explanations of such results are discussed.
   
2. Ether extracted skim milk powder plus 35 per cent of fat as well as the synthetic type diet containing lactose as the sole carbohydrate were suitable rations for studying certain aspects of the nutritional value of fats.
   
3. Greater differences in the nutritive value of fats on a lactose containing diet were obtained the younger the rat at the start of the experiment. However, from practical considerations, weanling rats 21 days of age may be used in these studies.
   
4. With the basal ration of ether-extracted-skim-milk powder, increasingly greater differences in the nutritive value of butter fat and corn oil resulted as the fat level was raised from 25 to 35 per cent of the diet.
   

^* Published with the approval of the Director of the Wisconsin Agricultural Experiment Station. This work was supported in part by grants from the Evaporated Milk Association, Chicago; the National Dairy Council, Chicago; the Wisconsin Alumni Research Foundation; and the Works Progress Administration. We are indebted to Merck and Co., Rahway, New Jersey, for supplies of thiamine, riboflavin, pyridoxine, calcium pantothenate, and choline; to Wilson Laboratories, Chicago, for the liver extract; to Winthrop Chemical Company, New York, for crystalline vitamin D₂.

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				L. P. ZIALCITA JR. and H. H. MITCHELL CORN OIL AND BUTTERFAT ESSENTIALLY EQUAL IN GROWTH-PROMOTING VALUE Science, July 21, 1944; 100(2586): 60 - 62. [PDF]

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