Rural Sciiooi, Leaflet. 



^057 



Average Yields of Digestible Food per Acre in New York 



ATBiAOE YIEUe OF DICESTIBLB POOD PEK ACRE ID H.Y. 

 Ten Yoare. 1898 - 1907. 



tlt&lta 1699 



Com 



whaat 



OatB 



Tlaothj Ba7 



Potatoes 



■■ Protein 



I I Cartchjdretee • 2-1/4 tloes Fat. 



Note. — There are three great classes of food materials for man and beast: pro- 

 teins, carbohydrates, and fats. 



Protein is of particular importance in building up muscle and in making milk 

 and eggs. Bran, oil meal, alfalfa, lean meat, milk, eggs, beans, peas are rich 

 in protein. Protein contains about i6 per cent, of nitrogen. The most expensive 

 purchased food for men and animals is the protein. 



Carbohydrates do not contain any nitrogen. Starch and sugar are pure carbo- 

 hydrates. Timothy hay, com stalks, com meal are rich in carbohydrates. 



The fats serve about the same function as carbohydrates except that they 

 are on the average about 2} times as efTective. Fats and carbohydrates are 

 often given together as in the table. 



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