FEEDING BY-PRODUCTS 399 



and the profit on each lot of five hogs with gain in live 

 weight at 5 and 6 cents per pound. Market conditions 

 sliould be carefully considered in this connection. 



FERTILIZER "TANKAGE" NOT A FOOD 



The use of the term tankage should not lead to the 

 idea that the concentrated tankage used as a fertilizer is 

 suitable for feed, for such is not the case. Tiie packing- 

 house residues prepared for feeding purposes, from 

 which the objectionable odors and disease germs have 

 been eliminated, and which have been ground almost to 

 the fineness of middlings, constitute an entirely differ- 

 ent article. The analyses given in preceding paragraphs 

 show considerable diversity in their quality, but most 

 satisfactory results have been obtained with the better 

 grades, and of late the largest demand has been for those 

 that by reason of their protein content are termed "60 

 per cent" product. 



OTHER PACKING-HOUSE BY-PRODUCTS 



Packing-house by-products of minor importance in 

 swine-feeding are dried blood and ground bone. These 

 are sold under various names, such as "blood flour," 

 "blood meal," and "bone meal." 



It is claimed that the dried blood offered commer- 

 cially contains about 85 per cent of protein. Its value is 

 greatest for very young and unthrifty pigs. Professor 

 Henry recommends feeding two ounces of dried blood 

 per 100 pounds of pig. The price of dried blood is rela- 

 tively high considered as a feeding stuff. 



