Voluntary activity in the rat as related to intake of whole yeast.

Abstract

7 control rats and 8 exptl. rats, all [female][female], were fed a vit.-free basal diet, supplemented by 9 drops of cod liver oil per day. Control animals received in addition 1.0 gm. powdered whole yeast per day, and experimentals were fed about 0.2 gm. of yeast per day, or enough to allow a wt. gain of 10 gms. per wk. per rat. The expt. was continued for 8 wks. All rats were placed in individual activity cages, with automatic recording devices, and their activity was recorded once a day. Control rats were significantly more active than exptl. rats.