46 FEEDING FARM ANIMALS 



tity absorbed is spoken of as the amount digested or 

 absorbed into the system. Digestibility refers to the 

 true food value of any nutrient. Every food, there- 

 fore, regardless of the balance of its proximate 

 principles, contains both digestible and indigestible 

 matter. To know the proportion of each part is 



TOTAL NUMBER OF POUNDS IN 2000 POUNDS OF SUBSTANCE 



5 10 20 30 50 75 IQO 125 15.0 175 200 



WHOLE WHEAT 



FLOUR 



WHEAT BRAN 



CORN 



CORN MEAL 



DRIED BEET PULP 



OATS 



OAT MEAL 



PEAS, GARDEN 



BEANS.GARDEN 



BEEF 



CHEESE 



TIMOTHY HAY 



RED CLOVER HAY 



ALFALFA HAY 



MINERAL MATTER IN SOME COMMON FOODS 



The total number of pounds of mineral matter in a ton of certain sub- 

 stance is here shown. Notice how small is the quantity in a ton of wheat 

 flour. Wheat bran, on the other hand, is abundantly supplied. In our 

 methods of manufacture farm animals profit at the expense of the human 

 family. 



necessary if the feeder is to make use of his feeds 

 to the best advantage. 



How Digestibility of a Food Is Determined. The 

 general method of investigation to obtain the diges- 

 tibility of the various constituents of a feeding stuff 

 has been to supply an animal with weighed quanti- 

 ties of food the composition of which has been as- 

 certained by chemical analysis. Within the period 

 during which such an experiment is being con- 



