. Principles of agricultural chemistry [microform] . Fig. 83.—Goats ready for digestion Carolina Station. method. The metabolic products in an excrement, then, cannotbe greater than the protein digested from it with pepsin-hydro-chloric acid, though they may be less. As a result of 20 experiments, Kuhn found from to of pepsin-soluble nitrogen in excrement from oxen, with anaverage of gm. for each 100 gm. of digested dry matter.^ Landw. Versuchs-stat., 1894, p. 204. 398 PRINCIPLES OF AGRICUETURAI. CHEMISTRY The averages of other workers are as follows: Pfeifif
. Principles of agricultural chemistry [microform] . Fig. 83.—Goats ready for digestion Carolina Station. method. The metabolic products in an excrement, then, cannotbe greater than the protein digested from it with pepsin-hydro-chloric acid, though they may be less. As a result of 20 experiments, Kuhn found from to of pepsin-soluble nitrogen in excrement from oxen, with anaverage of gm. for each 100 gm. of digested dry matter.^ Landw. Versuchs-stat., 1894, p. 204. 398 PRINCIPLES OF AGRICUETURAI. CHEMISTRY The averages of other workers are as follows: Pfeififer , Jordan gm., Wolfe gm. It appears that, on anaverage, not more than gm. of metabolic nitrogen (equal gm. protein) is excreted per 100 grams of digested dry mat-ter. Some metabolic mineral matter is also present in the Fig. 84.—Stall used for digestion experiments with Station. Digestion Experiments.—The nutrients which disappear duringthe passage of food through the animal body are said to bedigested. All that disappear do not pass through the membranesof the digestive organs, however, as some of them are convertedinto marsh gas and carbon dioxide by fermentation and escape asgases. The object of a digestion experiment is to determine, bytrials on animals, the actual amounts of the different nutrientswhich are digested. In a digestion experiment, a known quantityof food is fed, the excrement from it collected, and both foodand excrement are subjected to analysis. The quantity of eachnutrient fed and digested is calculated, and the quantity ofnutrient digested is divided by the quantity fed. The dividend,expressed as percentages, is the coefficient of digestibility. DIGESTION 399 With men, the faeces from different meals are not mixed inthe body, and can easily be separated by appr
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