392 THE FEEDING OF ANIMALS 



with small horses," a conclusion which is entirely con- 

 sistent with observation and related facts. Lavalard's 

 formula would furnish a 1,000-pound horse, doing ordi- 

 nary work, with 12.1 pounds of digestible nutrients daily, 

 a quantity not inconsistent with the German standard. 

 Kellner has recommended the following average stan- 

 dards for working horses to include maintenance; 



Requikements op the Working Horse* 



For light work 



For medium work 

 For heavy work 



Rations corresponding to these standards would be 

 as follows: 



Far light work For medium work 



10 lbs. mixed hay. 10 lbs. mixed hay. 



5 lbs. cracked com. 7 lbs. cracked com. 



2 lbs. wheat middlings. 3 lbs. wheat middlings. 



1 lb. wheat bran. 1 lb. brewers' grains, dried. 



For heavy work 

 10 lbs. mixed hay. 

 10 lbs. cracked com. 



4 lbs. wheat middlings. 



1 lb. brewers' grains. 



486. Estimate of work ration for the horse based 

 on energy relations. — ^The results of the masterly and 

 extensive metabolism investigations which Zuntz had 

 carried on with a horse under various conditions may 

 properly be used for computing a ration. This investiga^ 

 tor determined the oxygen consumption, which is equiva- 

 lent to ascertaining the food use, by a horse at rest, when 



♦Based on true protein and productive values. 



