Screenings jn Feeding Stuffs. 13 



also in common use. For a description of the means employed in 

 some factories where screenings are used see pages 10 and 11. 



The difficulty of grinding the screenings containing all of the 

 weed seeds is due to the hard flinty seed-coat of some, such as lamb's 

 quarters, and the very small size of others, as tumbling mustard. 

 These two seeds, it will be noticed, make up over 95 per cent, of 

 the unground seeds in the feed cited above. 



Screenings carefully recleaned over a screen with perforations 

 one-fourteenth of an inch in diameter to remove the black seeds may 

 be satisfactorily ground by an ordinary chopper. By referring to 

 the results of the feeding experiments reported on pages 34 and 35 

 it will be seen that the removal of the black seeds will greatly 

 improve the feeding value of the remainder. 



Screenings in Feeding StuSs. 



The demand for mill feeds has increased enormously during the 

 past few years. Mills that have established a reputation for supplying 

 feeds of good quality have difficulty in supplying the demand for their 

 products but there are some millers who take advantage of this 

 heavy demand to practise a fraudulent and dangerous adulteration. 

 This adulteration consists in the mixing of screenings, either ground 

 or unground, with bran, shorts, chop-feed, etc. 



Following some investigations made by the Seed Branch into 

 the occurrence of vital weed seeds in feeding stuffs, the following 

 amended standards of quality for grain products were adopted by 

 Order in Council bearing date May 3, 1911, the part in italics being 

 added: — 



13. Bran is a product of the milling of wheat or other 

 grain, and contains not less than fourteen (14) per cent of 

 proteids, not less than three (3) per cent of fat, not more than 

 ten (10) per cent of crude fibre, and must be free from vital seeds 

 of any of the noxious weeds defined by the Governor in Council 

 under "The Seed Control Ad." 



14. Shorts or middlings is the coarser material sifted out 

 from the products of a second treatment of the grain by 

 crushing the coarsely ground material that is sifted out from 

 the bran after the first grinding; and contains not less than 

 fifteen (15) per cent of proteids, not less than four (4) per cent 

 of fat, not more than eight (8) per cent of crude fibre, and must 

 be free from vital seeds of any of the noxious weeds defined by 

 the Governor in Council under "The Seed Control Act." 



15. Chop-feed is whole grain of one or more kinds more or 

 less finely ground, and contains not less than ten (10) percent 

 of proteids, not less than two (2) per cent of fat, not more than 

 (10) per cent of crude fibre, and must be free from vital seeds of 

 any of the noxious weeds defined by the Governor in Council under 

 "The Seed Control Act." 



The enforcement of these regulations is in the hands of the Depart- 

 ment of Inland Revenue. 



