296 



THE FEEDING OF ANIMALS 



exact limits to which there is universal agreement. A 

 narrow ratio is one where the proportion of protein is 

 relatively large, not less perhaps than 1:6.5. A wide 

 ratio is one where the carbohydrates are very greatly 

 predominant, or in larger proportion perhaps than 1:8. 

 Anything between 1 : 5.5 and 1 : 8 may properly be 

 spoken of as a medium ratio. 



Merely for the piu-pose, of illustration, three feeding 

 standards are given in this connection. These are selected 

 from standards proposed by Wolff, as modified by Leh- 

 mann. They refer in all instances to animals weighing 

 1,000 pounds: 



These and other standards will be discussed later 

 when we come to consider the feeding of the various 

 farm animals. Our present purpose is simply to make 

 clear the steps necessary to bringing the quantity and 

 composition of the ration into conformity with the 

 standard selected. 



394. Calctxlating a ration. — ^As a means of showing 

 the steps involved in calculating what a ration is, and 

 how to improve it if necessary, we will assume that it is 

 desired to learn whether a food mixture which a milch 

 cow is eating is what it should be, and if it is not, how to 



