Laboratory Exercises 359 
“13. Nurritive Ratio 
Object. To learn to balance rations. 
Materials. None. 
Directions. By “nutritive ratio’ is meant the ratio which 
exists between the amount of digestible protein in a given feeding 
stuff, and the amount of digestible carbohydrates and ether extract 
it contains. It is computed as follows: the amount of digestible 
fat or ether extract is multiplied by 23; the product added to the 
digestible carbohydrates, and the sum divided by the digestible 
protein. Calculate the nutritive ratio of the following foods: corn, 
oats, timothy, page 65. See Table 6, page 388, for composition. 
Calculate the ratio of the following ration : — 
AMOUNT OF FEED IN 
AATTER PROTEI CARBOHYDRATES: Fat 
Pounps Dry M my 
20 timothy hay? 2 2 |ysave anak coals t pede ie eda ages 
4oats .. at pew deoane tease hvacau tant etna last amaen® it tu sce [lentals P 
4corn .. se |saeee Fedo egret ey ese che 9 Aa hey mea ch erg a eer [I Econ 
14. Forming a Ration 
Object. To learn to form a ration from given feeds. 
Materials. None. 
Directions. Form a ration, using any of the foods given below. 
It should contain 24 pounds of dry matter with a nutritive ratio of 
1.6. Approximately one-third of the dry matter should be grain, 
page 66. 
Choosing foods for a ration 
A food is purchased for the digestible material init. The water 
and the indigestible material are like the ‘‘ filler” in a fertilizer. 
Add the digestible protein, the digestible carbohydrates, and the 
