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. 



When lo8 pounds cost $20. 

 1 pound will cost 1-.7 cents. 



112. Cottonseed meal contains 37.2 per cent of digesti- 

 ble protein. When it sells for $32 a ton. w^hat is the cost 

 of .each pound of digestible protein ? 



113. When a i)ound of digestible protein costs 12. H 

 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 num1)er of pounds of digestible nutri- 

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



