July, 1939) INSPECTION OF FEEDING STUFFS 7 



in protein. Nine of these were below guarantee less than 

 one-half per cent. Eight were below guarantee more than 

 one-half per cent but less than one per cent. Eight were 

 below guarantee more than one per cent. 



Seventy-eight brands or 16.1 per cent were below guaran- 

 tee in fat. Thirty-three of these were less than one-fourth 

 per cent below guarantee. Forty-one were more than one- 

 fourth per cent but less than one per cent below guarantee. 

 Four were more than one per cent below guarantee. 



Forty-two brands or 8.7 per cent contained an excessive 

 amount of crude fiber. Sixty-six brands were below guaran- 

 tee in carbohydrates. Thirty-seven samples failed to carry 

 the carbohydrates guarantee. In the analysis of a feeding 

 stuff, the percentage of carbohydrates is usually determined 

 indirectly. It is found by subtracting the sum of the percent- 

 ages of protein, fat, moisture and ash from 100. It is obvious 

 that an excess of protein or fat over the manufacturer's 

 guarantee decreases the percentage of carbohydrates found. 

 Nearly all of this year's carbohydrates deficiencies are due to 

 the protein or fat or both exceeding the guarantee. 



Manganese was listed as an ingredient in 67 brands. In 

 40 brands the amount added was specified. Since different 

 manganese compounds were added as a source of manganese 

 and different forms of stating the amount of the manganese 

 compound added were used, all were calculated to parts per 

 million of the element manganese. The amount of man- 

 ganese present in the 40 brands containing a specified amount 

 was determined by analysis. The results of the analysis are 

 shown in the list of ingredients. Only two of the 40 brands 

 analyzed failed to contain as much manganese as was declared. 



In the tabulation of the analytical figures, pp. 12 to 106 

 inclusive, those figures one-half per cent or more below 

 guarantee in protein and one-fourth per cent or more below 

 guarantee in fat are printed in bold-faced type. 



Table I shows the percentage of samples failing to con- 

 form to the guarantee in each of the last fourteen years. 



