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Nutritive values of yeast grown on acetic acid and of to some extent nucleic acid extracted yeasts grown on acetic acid or molasses were studied using colostomized chickens.1. Apparent and true digestibilities of crude protein of yeast grown on acetic acid were the highest among them, being 86 and 90per cent respectively and those were about 9per cent higher than rest of them.2. Biological values and net protein utilization values of three kinds of yeasts varied from 77 to 82 and 66 to 69per cent respectively and there was no statistical significance among them.3. Metabolizable energy values (kcal/g) of yeast grown on acetic acid and yeasts grown on acetic acid or molasses but to some extent nucleic acid extracted were 3.84, 3.55 and 3.08, respectively.4. It was showed that the extraction of nucleic acid from the yeast had a trend of decreasing protein digestibility and metabolizable energy value of the yeast itself.

Studies on Digestibility, Biological Value and Metabolizable Energy of Single Cell Protein Sources for the Chicken