. Carnegie Institution of Washington publication. FEEDING EXPERIMENTS WITH ISOLATED FOOD SUBSTANCES. 31. ? Chart X.—Rat 12, fed on Dog Biscuit-Lard Diet for 84 days and then on Milk powder-Starch-Lard Diet for 113 days. Numbers on Body-weight line indicate time at which each period began. DISCUSSION. The rats xxviii and xxix showed a steady decline on the dog- biscuit-fat mixture (p. 13). In considering the quantity of food eaten it must be borne in mind that the nitrogen content was rather low (N= per cent). Rats 10, 11, and 12 also showed, during the early period of the experiment,
. Carnegie Institution of Washington publication. FEEDING EXPERIMENTS WITH ISOLATED FOOD SUBSTANCES. 31. ? Chart X.—Rat 12, fed on Dog Biscuit-Lard Diet for 84 days and then on Milk powder-Starch-Lard Diet for 113 days. Numbers on Body-weight line indicate time at which each period began. DISCUSSION. The rats xxviii and xxix showed a steady decline on the dog- biscuit-fat mixture (p. 13). In considering the quantity of food eaten it must be borne in mind that the nitrogen content was rather low (N= per cent). Rats 10, 11, and 12 also showed, during the early period of the experiment, a steady decline on the same diet, although it contained more nitrogen. The temporary improvement shown after several weeks at the point marked 3 indicates the introduction of a change in diet. The improvement was, however, only temporary, as the charts in- dicate. The curves of body-weight in these animals recall those published by Falta and Noegerrath and correspond with the data of other investigators mentioned above. They indicate the type of experiment which is unsuccessful because of more or less obvious insufficiency in food-intake or stored supply. In the case of rats xxviii and 10, for example, this is pronounced and a steady and continuous decline is noted. The decline of rat xxix, at first gradual, became extremely marked with the striking decrease in the food- intake at the end of the experiment. The other illustrations (rats 11 and 12) show intermediate types. As a rule, older, full-grown animals exhibit slower decline than younger rats (of smaller weight). Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Carnegie Institution of Washington. Washington, Carnegie Institution of Washington
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