144 MAKXIAL OF CATTLE-FEEDING. 



it is practically impossible to feed herbivorous animals on 

 pure protein or protein and fat ; but the general principles 

 deduced fi'om tlie experiments on carnivora are applicable 

 also to herbivorous animals. In tlie present section v^^e 

 shall give special prominence to experiments on domestic 

 herbivorous animals, and shall take occasion to point out, 

 in passing, some confirmations of the results obtained on 

 carnivora by Voit and others. 



The ordinary fodder of herbivorous animals, leaving out 

 of consideration, for the present, water and mineral matters, 

 consists essentially of protein and carbhydrates with small 

 quantities of fat. 



A large number of experiments on these animals have 

 been made. As of especial importance for our present 

 pin'pose may be mentioned those of Grouven,* at Salz- 

 munde, and of Ilenneberg & Stohmann,f at Weende, on 

 oxen ; those of G. Kuhn & M. Fleischer, :]: at Mockern, 

 on milk cows ; and those of E. Schulze & M. Marckei', § in 

 Weende, on sheep. 



Of these, the Weende experiments on oxen in particular 

 are of the highest value, both for our present purpose and 

 many others, having been executed in the most careful 

 and thoroughly scientific manner. 



The Protein Consuraption is Determined by the 

 Supply in the Food. — The following experiments on 

 oxen by Henneberg & Stohmann {loo, eit), in which the 

 amount of protein in the food varies while that of the 

 non-nitrogenous nutrients remains essentially the same, 



* Zweiter Salzmunde Beriolit, 1864. 



f '■^ Beifcrag-e zur Begrundung einer RationeUen Fdtterung der Wie- 

 derkaner," 1864, and "Neue Beitrage," etc^ 1871. 

 :j: Landw. Versuchs-Stationen, XII , 197 and 450. 

 § Journal fiir Landwirtlisclaaft, 1870 and 1871. 



