CHAPTER VII 



ANIMAL PROTEIN, MILK AND MISCELLANEOUS FEEDS 



Packing House By-Products. Large quantities of by- 

 products are produced at the packing houses which are 

 used in stock and poultry feeds. These products include 

 meat scrap, meat meal, tankage, and dried blood or blood 

 meal. All of these feeds are very rich in highly digestible 

 protein and with the exception of blood contain consider- 

 able mineral matter in the form of lime and phosphoric 

 acid. Meat scrap and tankage are made from fresh meat 

 scraps and fat trimmings, from which the fat is rendered 

 by being drawn off in a liquid form after the scraps have 

 been cooked by steam under a high pressure. The scraps 

 are then dried and ground into a meal, giving a product 

 which contains from 40 to 50 per cent of crude protein, 

 and from i to 10 per cent of fat. The composition of this 

 product varies greatly and it should always be bought on 3 

 guaranteed analysis. 



Blood meal usually contains a much higher per cent of 

 crude protein than meat scraps but much less of mineral 

 matter, since it does not contain any bone. Blood meal is 

 used up largely in commercial calf meal and mixed mashes 

 while meat scraps have a very extensive sale as a poultry 

 feed. Blood meal is sometimes added to the meat scrap 

 to increase the protein content. The average home made 



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