Abstract
Summary
1. In the feces of albino rats, statistically significant reductions in counts of the total anaerobes, total aerobes and total lactobacilli were obtained by the addition of terramycin to the 3 diets employed. On the other hand, E. coli, Proteus spp. and, to a slight extent fecal streptococci, were increased in numbers. The increase in Proteus was unaccompanied by a decrease in E. coll. 2. The only ration effect was observed with the counts of fecal streptococci: the animals receiving the high protein rations showed a lower count than those receiving either the high carbohydrate or the basal ration. 3. The effect of terramycin upon counts of all organisms studied was found to be independent of ration in which the terramycin was incorporated (lack of statistically significant interaction between diet and terramycin). 4. The effects here reported were compared to the effects observed in a previous study.
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