346 POULTRY PRODUCTION 



experiments with chickens, are 65.9 pounds of protein, 13.01 

 pounds of fat, and pounds of nitrogen-free extract. It 

 contains 4.1 pounds of ash, and has a nutritive ratio of 1 to 

 0.44 for chickens. It contains no crude fiber. 



Middlings {Wheat). — ^Wheat middlings are more finely 

 ground than either bran or shorts, and run lower in crude 

 fiber, ash, and protein, but higher in carbohydrates and fats. 

 They are frequently only a good grade of shorts, but should 

 more nearly approach low-grade flour. They will usually 

 contain more gluten than most of the grain by-products, 

 and because of their finely ground, heavy character, should 

 be mixed with bulkier feeds. 



The average amounts of the nutrients found in 100 pounds 

 of wheat middlings are 10.7 pounds of water, '3.7 pounds^ of 

 ash, 17.8 pounds of crude protein, 62.8 pounds of carbohy- 

 drates, of which 4.7 pounds are crude fiber, and 5 pounds 

 are fat. The proportions of these digestible for chickens have 

 not been determined. 



Milk Albumin. — In the manufacture of milk sugar, the 

 casein is precipitated by means of lime and the resultant 

 cake, which is composed of casein and lime, is ground and 

 placed on the market with milk albumin as a trade name. It 

 is a good source of protein, as it is palatable, attractive, easy 

 to handle, and keeps well. It is, however, usually too high 

 in price to feed to poultry. 



The amounts of digestible nutrients found in 100 pounds 

 of milk albumin as determined by digestion experiments with 

 larger animals are 78.6 pounds of protein, 0.5 pounds of fat, 

 and 8.6 pounds of nitrogen-free extract. It contains 2.9 

 pounds of ash and has a nutritive ratio of 1 to 0.1 for larger 

 animals. It contains no crude fiber. 



Milk (Butter). — Buttermilk is similar to skim milk, but has 

 a still higher feeding value. The amounts of digestible 

 nutrients found in 100 pounds of buttermilk, as estimated 

 from digestion experiments with skim milk with swine, are 

 3.84 pounds of protein, 1.05 pounds of fat, and 3.92 pounds of 

 nitrogen-free extract. It contains 0.7 pounds of ash and has 

 a nutritive ratio of 1 to 1.6. It contains no crude fiber. 



