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Note to the Teacher.—The items brought out in this 
lesson will show how important it is that digestibility of 
a food be clearly understood. An animal fed a mixed 
ration digests only about two-thirds of its food. This 
means that approximately one-third of the food does not 
contribute in any way to the nourishment of the animal. 
Indicate some of the factors that influence digestibility. 
Show the wide ranges of the food nutrients of the more 
ONT mh wD 
LESSON FIVE 
FOOD NUTRIENTS 
Nutrients defined. 
Most feeding stuffs are unbalanced. 
Digestibility defined. 
How digestibility of a food is determined. 
First step is to obtain composition. 
Coefficient of digestibility. 
Digestible nutrients. . 
Correct rations are based on digestibility. 
Each constituent is required. 
Foods must be appetizing. 
. Folly of light feeding. 
. Digestibility little influenced by quantity. 
. Individual character of the animal. 
. Digestibility decreases as plants mature. 
15. 
What most influences digestion. 
common feeding stuffs. 
43 
