PRINCIPLES OF FEEDING. 



143 



() In 100 pounds of oat straw there are, according 

 to the table, 90.8 pounds of dry matter, 1.2 pounds of 

 protein, 38.6 pounds of carbohydrates, 0.8 pounds of 

 ether extract. 



Then in 5 pounds of oat straw there are: 



5 X-'ynr = 4-54 pounds of dry matter; 



5 x-y;ir = -6 pounds of protein; 



5 x ~W~ = I -93 P oun ds of carbohydrates; and 



5 x ~ = .04 pounds of ether extract. 



Adding the amounts of these different substances con- 

 tained in: 



The nutritive ratio is 1:7. 



Comparing this second trial ration with that 

 of the standard, we find that the nutritive ratio 

 is that given for a horse doing light work. 



EXERCISE 8. (i) For fattening cattle, compound a 

 ration having a nutritive ratio of 1:5.4 containing two 

 different kinds of roughage and one concentrate. 



(2) For a milch cow, compound a ration consisting of 

 red clover, hay, corn silage, oat straw, and wheat bran, 

 and having a nutritive ratio of 1:7, and approximating 

 25 pounds of dry matter. 



(3) For cattle, compound a maintenance ration hav- 

 ing a nutritive ratio of 1:10, and approximating 18 

 pounds of dry matter. 



