198 FEEDING OF FARM STOCK. 



Let us for example compare a given ration with a stand- 

 ard. Take a 900-pound milch cow giving 10 quarts per 

 day, and assume she is receiving the following ration : 

 10 pounds clover hay, 

 30 pounds corn silage, 

 4 pounds corn meal, 

 4 pounds bran. 



Looking at Table III, we see that 100 pounds of clover 

 hay contains 84.7 pounds of dry matter, 6.8 pounds of 

 digestible protein, 35.9 pounds digestible carbohydrates and 

 1.7 pounds digestible fat. If 100 pounds of the hay con- 

 tain these amounts, 10 pounds must contain 8-100 of them. 

 To calculate this, divide the amount given by -100 and mul- 

 tiply by 10. Thus : 



84.7-i-100X 10=8.47 pounds dry matter. 



6.8-f-100x 10=0.68 pounds digestible protein. 

 35.9-f-100X 10=3.59 pounds digestible carbohydrates. 

 1.7-^100X10=0.17 pounds digestible fat. 



By the table 100 pounds of corn silage contains 19.5 

 pounds dry matter, 0.8 pounds digestible protein, 11.0 

 pounds digestible carbohydrates and 0.5 pounds digestible 

 fat. In this case we divide the amount by 100. and multiply 

 by 30, as follows: 



19.5-1-100x30=5.85 pounds dry matter. 



0.8-r-lOOX 30=0.24 pounds digestible protein. 

 11.0^-100x30=3.30 pounds digestible carbohydrates. 

 0.5-f-100X 30=0.15 pounds digestible fat. 



Using Table III in the same way for corn meal and bran, 

 we find the four pounds of corn meal to contain : 



85.0-XLOOX 4=3.40 pounds dry matter. 



6.3-KLOOX 4=0.25 pounds digestible protein 

 67.0-f-100X 4=2.68 pounds digestible carbohydrates. 



3.5^-100x4=0.14 pounds digestible fat. 



and the four pounds of bran to contain : 

 88.1-r-lOOX 4=3.52 pounds dry matter. 

 12.0-=-100x4= .48 pounds digestible protein. 

 35.3-^-100X4=1.41 pounds digestible carbohydrates. 

 2.7-^-100X4= .11 pounds digestible fat. 



