CHAPTER XII 

 THE PACKINGHOUSE BY-PRODUCTS 



The packinghouse by-products produced in the ])ig; 

 slaughter houses, which are of use for feeding purposes, con- 

 sist of blood, bone, and meat scraps. These are worked into 

 various forms, but those of the most importance to the 

 stock feeder are tankage or meat meal, dried blood (blood 

 meal, blood flour, etc.), meat scraps, crackhngs, and ground 

 bone or bone meal. 



Tankage and meat meal are the same thing. Some 

 manufacturers, who are equipped to make up a special meat 

 product of this character for feeding purposes, market 

 their product under one name and some under another. In 

 the main essentials there is no difference between tankage, 

 which for feeding purposes usually is designated as ''Digester 

 Tankage," and meat meal. In fact, some firms sell it as 

 " Meat Meal Digester Tankage." 



A proper feeding tankage is made from meat trimmings, 

 which are thoroughly cooked for several hours in pressure 

 tanks under 50 to 60 pounds live steam pressure. This cook- 

 ing, together with a subsequent pressing of the material, re- 

 moves the principal part of the grease, after which the residue 

 is thoroughly dried under high heat in dryers especially de- 

 signed for that purpose. After being dried, this selected 

 material is ground and screened over special equipment 

 designed to put it in the best possible mechanical condition 



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