ANIMAL FEEDING. 55 



ble there is no question. Since feeding stuffs vary in 

 cost or value as well as in amount of digestible nutri- 

 ents, it follows that in compounding rations market prices 

 of feeds should always be considered. The farm is a 

 factory for producing carbohydrates and fat. As much 

 protein as possible should be grown also. Usually, how- 

 ever, this cannot be done sufficiently to supply every need ; 

 hence it must be purchased. Without it best results can- 

 not follow. 



What protein costs. It is possible for the farmer to 

 purchase corn, oats, gluten meal, cottonseed meal, wheat 

 bran, and numerous other grains or feeding stuffs con- 

 taining protein. In what form shall he purchase it ? 



111. Corn contains 7.9 per cent digestible protein. 

 When corn sells for $20 a ton what is the cost of a pound 

 of digestible protein ? 



7.9 X 20 = 158 pounds in a ton. 



158 pounds cost $20. 



1 pound costs 12.6 cents. 



112. Cottonseed meal contains 37.2 per cent of digesti- 

 ble protein. When it sells for $32 a ton, what is the cost 

 of .each pound of digestible protein ? 



113. When a pound of digestible protein costs 12.6 

 cents in corn and 4.3 cents in cottonseed meal, how many 

 times more expensive is it in corn than in cottonseed 

 meal? 



114. When gluten meal sells at $25 a ton, a pound of 

 digestible protein costs 4.9 cents. How many pounds of 

 digestible protein in a ton of gluten? 



Cost of total digestible nutrients. In purchasing 

 feeding stuffs the number of pounds of digestible nutri- 

 ents must be considered as well as the cost per ton. 



