48 HORSE MANAGEMENT IN INDIA 



kidneys and skin eliminate water; the degraded nitro- 

 genous matters, and broken- up mineral substances being 

 excreted by the kidneys. 



Repair of Waste. — In order to supply material for 

 the repair of the constant waste experienced by the system, 

 the animal must have food which shall answer the follow- 

 ing conditions : — 



1. It must contain a proper proportion of the 



elements necessary for the building up of 

 the new tissue. 



2. It must be digestible. 



3. It must be of sufficient bulk for the stomach 



and intestines to act on it. 



4. It must be palatable. 



Grain, grasses, and roots, used in suitable proportions, 

 answer the above conditions. As chemistry enables us to 

 analyse these foods, we may, by its aid, approximately 

 judge of their respective nutritive values. The following 

 tables may serve as a guide to the reader : — 



