1894.] PUBLIC DOCUMENT — No. 33. 149 



Analytical Methods. 



At the close of the period these daily "tenths," after 

 being weighed in an approximately air-dry condition, were 

 mixed, and after he'mr^ once run through a coarse grinding 

 mill to break the pellets, duplicate dry matter determinations 

 were made and the material then ground fine for a complete 

 analysis. 



Moisture determinations were made in an air bath at a 

 temperature of 102° to 103° C, about seven grams of sub- 

 stance being taken. Total nitrogen was determined by the 

 Kjeldahl method. The fat was extracted with anhydrous 

 ether. The methods for the determination of ash and cellu- 

 lose were those described by the Association of Official Agri- 

 cultural Chemists. 



The Feeds tested. 

 The object in making these experiments has been to obtain 

 a knowledge of the comparative digestibility of the various 

 concentrated by-products, so called, that are being so exten- 

 sively offered for sale in our Massachusetts markets. The 

 digestibility of hay of mixed grasses grown upon the station 

 grounds was first determined, and then a certain amount of 

 the concentrated food was substituted for an equal amount 

 of the hay, as the data that is to follow will show. 



Brief Description of the Feeds tested. 

 Hat/ of Mixed Grasses. 

 The hay is intended to be a fair average of that grown 

 upon the station grounds. It was harvested the latter part 

 of June, when the various grasses were in blossom. The 

 grasses composing the same were principally herd's grass, 

 red top, Kentucky blue-grass, meadow fescue, sweet-scented 

 vernal grass and a fair sprinkling of clover. 



Buffalo Gluten Feed. 

 This is a by-product in the manufacture of starch from 

 corn. The starch is separated from the yellow or albuminous 



