46 



Grain screenings. Grain screenings consist of the light seed, 

 weed seeds, chaff and dirt separated from grain in the process of 

 winnowing. The composition of grain screenings depends upon 

 the kind of seed from which they are separated and their freedom 

 from dirt and chaff. They necessarily vary so much in composi- 

 tion that no general statement as to their value can be made. 

 The writer has seen screenings being used in a molasses feed fac- 

 tory in the middle west which contained a large amount of straw 

 and chaff. Such material cannot be considered much superior 

 to straw in feeding value. Other samples received at this station 

 were free from chaff and dirt and contained nothing but light 

 grain and weed seed and possessed considerable feeding value. 



Grain screenings are used extensively as a component of mo- 

 lasses feeds. Formerly one objection to their use was due to the 

 fact that they contained many whole weed seeds which would 

 pass through the animal without having their vitality impaired 

 and become a source of weeds on the fanii. With the improved 

 process of manufacturing molasses feeds the screenings are finely 

 grotmd and their germinating property destroyed. 



Following are the analyses of several samples of screenings 

 made at the Massachusetts station: 



(Pounds in 100.) 

 No. 1. No. 2. No. 3. 



Wheat Screenings. Wheat Screenings. Flax Screenings. 



Experiments made at this station have shown that a good 

 quality of wheat screenings has a digestibility of about 68 per- 

 cent, which is similar to the coefficient for wheat bran. When 

 finely ground and free from dirt, chaff and noxious seeds, they 

 possess considerable nutritive value. The feeder, however, is 

 entitled to know that they are in a mixture. 



Sample No. 1 as reported above, contained the following seeds : 

 light oats, oat hulls, wheat, wheat refuse, smutted grain, yellow 



