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The Nutritive Value of the Protein in Tobacco-Seed Oilmeal¹

Three Figures

Department of Chemistry, Kentucky Agricultural Experiment Station, University of Kentucky, Lexington

1. When tobacco-seed oilmeal was fed to rats at levels of 15 to 18% protein, the rats made only slow growth. The oilmeal was proved to be deficient in lysine.

2. When a ration containing tobacco-seed oilmeal as the source of protein was supplemented with casein, lactalbumin, skimmilk powder, or lysine, good growth was obtained. Rolled oats, cornmeal and gelatin were less satisfactory supplements to the oilmeal protein. Addition of wheat gluten was no more effective than increasing the proportion of tobacco-seed oilmeal so as to equalize the protein content of the two rations.

3. The biological values of the protein of tobacco-seed oilmeal and skimmilk powder when fed at a level of 10% were 51.4 and 78.5, respectively. Values for true digestibility of the two in the order named were 78.0 and 96.6. The biological value of the oilmeal protein when supplemented with lysine was approximately that of milk proteins.

4. Because of its relatively high net protein value tobacco-seed oilmeal deserves consideration as a source of dietary protein.

Manuscript received 24 September 1945.