120 



AGRICULTURAL EXPERIMENT STATION. 



The figures given in the foregoing tables have cost a great deal in 

 time and money, and they should be made useful. It seems to be 

 the custom for farmers to request those familiar with these tables 

 and their use to make up for them from certain specified materials 

 a ration adapted to a particular purpose. This is not necessary. A 

 person who has had the average training in mathematics which our 

 public schools give can by the use of the previous tables calculate a 

 new ration, or ascertain how the one he is feeding compares with the 

 standard. 



Perhaps the following calculations may serve to make plain the 

 manner in which this is done. It is a question we will suppose 

 whether the following ration is correct for a one thousand pound 

 milch cow. 



40 lbs. maize ensilage, 

 10 " Timothy hay, 

 4 *•' corn meal, 

 2 " wheat bran. 



Looking in the table of fodders analyses we find what is the com- 

 position of ensilage, and in the table of digestibility of feeding 

 stuffs under green fodder we find the digestibility of green maize 

 fodder, which differs but little, if any, from the digestibility of en- 

 silage. Using these two sets of figures we can calculate the pounds 

 of digestible material in 100 pounds of the food. 



Ensilage Per cent Pounds in 100. 



In 100 lbs. Digestible. 



Organic matter 18 2 X 70 = 12 74 



Protein 1 . 50 X 73 = 1 . 09 



Fat 68 X 75 = .51 



Nitrogen free extractive matter. . 10.26 X 67 = 6 87 



Crude fiber 5,68 X 72 = 4.09 



By the same method we ascertain the digestible material in a hun- 

 dred pounds of the other feeding stuffs in our ration, and these are 

 as follows : 



Digestible in One Hundred Pounds. 





Organic 

 Matter. 



12.74 

 39.39 

 78.67 

 60.48 



Protein 



Fat. 



Nitrogen Free 



Extractive 



Matter. 



Crude 

 Fiber. 





1.09 



3.45 



8.16 



11.75 



.61 

 1.03 

 4.33 

 2.61 



6 87 

 29.20 

 64.30 

 41.78 



4.09 





17.61 





1.41 



Wheat Bran. 



2.87 



