INSPECTION OF COMMERCIAL FEEDSTUFFS 



65 



Manganese in Feeds* 



Recent experimental evidence points to the fact that manganese deficiency 

 may be one of the contributing factors in causing slipped tendons (perosis) in 

 growing chicks. Many commercial rations now contain added manganese sul- 

 phate in small amounts. With the idea of presenting information as to the 

 normal manganese content of feed products and commercial mixtures, a large 

 number of manganese determinations were made on samples of feeding stuffs 

 collected in the course of inspection. None of the commercial mixtures, so far 

 as could be ascertained, contained added manganese sulphate. Samples reported 

 were all collected before the use of manganese sulphate had become general. 

 No recommendations are made as to the maximum or minimum amount that a 

 feed should contain: that should be left to the nutrition expert. The use of 

 manganese sulphate in home mixed rations in the small amounts advocated 

 necessitates very thorough mixing in order to insure uniform distribution through- 

 out the entire mixture. 



Manganese Content of Feeding Stuffs 



(Composite samples of 10 unless otherwise indicated) 



Alfalfa Products 



Alfalfa Meal (9 samples) 



Alfalfa Leaf Meal 

 Animal and Fish Products 



Steamed Bone Meal . 



Fish Meal 



Liver Meal, Argentine (1 sample) 



Moat Srrap, h0% Protein . 



Dried Skim Milk (7 samples) 

 Brewers and Distillers By-Products 



Dried Brewers Grains (3 samples) 



Corn Distillers Grains (4 samples) 

 Cereal Meals 



Corn Meal 



Ground Cats 

 Corn Products 



Gluten Meal (.5 samples) 



Gluten Feed 



Hominy Feed 

 Miscellaneous Mill Residues 



Dried Beet Pulp (5 samples 



Oat Feed, Oatmeal Mill By 

 Oil Cake Meals 



Cottonseed Meal 



Linseed Meal 



Soy Bean Meal . 

 Wheat Products 



Wheat Red Dog Flour 



Wheat Standard Middlings 



Wheat Mixed Feed 



Wheat Bran 



product (5 samples) 



Manganese Content of Commercial Poultry Mixtures 

 Manganese Sulphate Not Added 



Laying Mashes 



Growing and Starting Feeds 



Fattening Feeds . 



♦Analyses by John W. Kuzmeski. 



