Calculation of Standard Rations 287 



b}^ multiplying the percentages of composition by the 

 coefficients of digestibility and dividing the product by 

 100; that is, if timothy hay contains five per cent of 

 protein, 45 per cent of which is digestible, then forty- 

 five hundredths of five will be the percentage of diges- 

 tible protein in the hay. In this way the following 

 figures were obtained. The percentage of digestible 

 carbohydrates represents the sum of the quantities di- 

 gested from both the crude fiber and the nitrogen- 

 free extract. Tables are now published which show 

 percentages of digestible ingredients, and which Avill 

 render this calculation largely unnecessary: 



Total 



Digestible digestible 



Digestible carbohy- Digestible organic 



protein drates fat nut;fients 



% % % % 



. Timothy hay, late cut 2.3 40.8 1.1 44.1 



Clover hay, average quality 7.1 37.8 1.8 46.7 



Corn silage, average quality .9 12.6 .6 14.1 



Hominy chops 6.7 613 7.6 75.6 



Wheat bran 12. 39.8 2.7 54.5 



Linseed meal 28.2 40.6 2.9 717 



The second step is to calculate the pounds of digest- 

 ible nutrients in the quantities of the several feeding 

 stuffs to be used. It is clear, for instance, that ten 

 pounds of hay will contain ten one -hundredths of the 

 amounts in one hundred pounds, so we simply need to 

 multiply the percentage of digestible protein and so on 

 by ten and divide by one hundred in order to learn what 

 ten pounds of hay will furnish to the animal. If we make 

 this computation for each constituent of each feeding 

 stuff, we reach the figures of the following table 



