BUILDING MATERIAL 133 



that the pig would be compelled to take more bulk in the 

 form of water than would normally go with the proper 

 quantity of nutrients other than water. This would have 

 a tendency to distend the capacity of his digestive appara- 

 tus. An excess of water, however, would have detrimen- 

 tal effects upon the pig. 



The liquid feeds specified under the head of nitrog- 

 enous concentrates may likewise be considered either 

 as concentrates or roughages, the same as the green feeds 

 given under the head of carbonaceous concentrates. 



The nitrogenous roughages are given under two subject 

 heads, dry feeds and green feeds. The dry feeds are 

 roughages because of the large quantity of crude fiber 

 they contain. The green feeds also contain the crude 

 fiber, but relatively less than the dry feeds because they 

 at the same time contain a large quantity of water. This, 

 of course, plays an important part in the metabolism of 

 the animal body, and may take the place of water that is 

 fed as such in connection with dry feeds. 



The carbonaceous roughages are all in the form of 

 green feeds and may be considered in the same light, as 

 far as water is concerned, as the green feeds under the 

 head of nitrogenous roughages. 



WATER. 



Water, as already stated, is not generally considered a 

 food nutrient, but recent developments in the experimen- 

 tal work of the writer at the Illinois Agricultural Experi- 

 ment Station attach enough importance to a definite 

 quantity of water in a ration that it seems advisable to 

 classify it also as a nutrient. 



Water is necessary in the metabolism of the animal 

 body and is present to a greater or less extent as a part 



