CHAPTER XIII 



SCIENTIFIC SWINE FEEDING 



This discussion is based largely on research work by the author at 

 the University of Illinois. It is a summary of, and somewhat similar 

 to parts of earlier publications by the author, namely, "Swine," published 

 by the Breeder's Gazelle, Chicago: Illinois agricultural experiment sta- 

 t'on bulletins and circulars; and "A Correspondence Course in Swine 

 Husbandry," published by The Correspondence College of Agriculture, 

 Fort Wayne, Ind. 



The principles outlined in this chapter apply to the feeding 

 of other animals, once the necessary amounts of nutrients have 

 been determined. 



EXPLANATION OF TERMS 



Nutrients. — The ingredients or compounds of a feed such as 

 protein, carbohydrates, and ether extract or fat, and also min- 

 eral matter and water. 



Digestible Nutrients. — Those portions of the nutrients that 

 are absorbed in the alimentary tract and not passed out in the 

 feces. 



Coefficient of Digestibility. — The per cent, of a feed or of a 

 nutrient that is digested. The total quantity eaten minus 

 that appearing in the feces divided by the total quantity gives 

 the coefficient of digestibility or the per cent, digested. 



Concentrated Feed. — A feed that contains a comparatively 

 large per cent, of digestible nutrients and a comparatively 

 small per cent, of undigestible material, or in other words a 

 feed that is not bulky. 



Roughage. — The opposite of a concentrate. A bulky feed, 

 or one containing a relatively large proportion of undigestible 

 material. 



Metabolism. — This is the process by which food is built up 

 into living matter, and by which living matter is broken down 



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