COMMON POULTRY FEEDS 225 



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scrap is composed largely of the refuse of slaughter houses, 

 which is boiled under pressure, then put in a large press, and 

 squeezed until all the liquid is forced out. Meat scrap con- 

 tains lean meat, fat, and considerable bone. Meat meal 

 is meat scrap ground into small particles. Dried blood is a 

 refuse product from slaughter houses, sometimes but not 

 commonly used as a poultry feed. It is dark in color, 

 and finely ground. 



In purchasing meat products, quality should be the first 

 consideration. Meat scrap is more used than any other meat 

 product. It varies greatly in quality, but there is a high 

 grade meat scrap which contains 50 per cent of protein, and is 

 put up most carefully. There is a lower grade which yields 

 from 30 to 35 per cent of protein, but is often poorly ren- 

 dered, and contains products which are undesirable in the 

 rations. Good meat scrap should contain about 50 per cent 

 of protein. Dry granulated bone is another protein product 

 which yields 25 to 30 per cent of protein. In certain sections 

 where available, fish scrap is utilized, much of it being de- 

 rived from the manufacture of glue. Fish scrap contains in 

 the neighborhood of 40 per cent protein. Milk albumen is 

 another highly nitrogenous feed material; it is manufactured 

 especially for poultry feeding. The protein content varies 

 considerably, 50 per cent being the average analysis. 



Meat Products 



Dry Matter Protein Carbohydrates Fat 



Meat Scrap. High Grade 90 50-60 none 25 



Dry Granulated Bone 92 25-30 none 3 



Fish Scrap 90 35-50 none 15 



Milk Albumin 85 20-50 none 3 



Concentrated Vegetable Products. There are five con- 

 centrated by-products which on analysis yield a high pro- 

 tein content, and are used quite extensively for poultry 

 feed. Cottonseed meal ranks high as a protein carrier, 

 containing 42 per cent of protein. The meal is of a very 

 bright yellow color. It is a by-product from the manufac- 

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