July, 1940] Inspection of Feeding Stuffs ' 7 



below guarantee. Thirty-two were more than one-fourth per 

 cent but less ihan one per cent below guarantee. One was 

 more than one per cent below guarantee. The greatest fat 

 deficiency was 1.21 per cent. 



Thirty-seven brands, or 7.5 per cent, contained an excessive 

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

 tee in carbohydrates. Twenty-three samples failed to carry 

 the carhobydrates guarantee. In the analysis of a feeding 

 stuff, the percentage of carhobydrates is usually determined 

 indirectly. It is found by substracting 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 guar- 

 antee decreases the percentage of carbohydrates found. Nearly 

 all of this year's carbohydrates deficiencies are due to the pro- 

 tein or fat or both exceeding the guarantee. 



Manganese was listed as an ingredient in 111 brands. In 

 44 of these brands the amount added was specified. Since dif- 

 ferent manganese compounds were added as a source of man- 

 ganese and different forms of stating the amount of the man- 

 ganese compound added were used, all were calculated to parts 

 per million of the element maganese. The amount of manga- 

 nese present in the 44 brands containing a specified amount 

 was determined by analysis. The results of the analysis are 

 shown in the list of ingredients. Only one of the 44 l^rands 

 analyzed failed to contain as much manganese as was declared. 

 In many cases the amount of manganese found is consider- 

 ably in excess of the amount declared added by the manufac- 

 turer. This excess may be due to the manganese naturally 

 occurring in the ingredients. 



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

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

 antee in protein, one-fourth per cent or more below guarantee 

 in fat, and one per cent or more above guarantee in crude 

 fiber 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 fifteen years. 



