INSPECTION OF COMMERCIAL FEEDSTUFFS 23 



Animal and Fish Products 



Owing to scarcit\- and consequent restrictions upon the sale and use of fish 

 and meat scrap, a smaller number of these products was found. The oleic acid 

 content, an indication of decomposition or the condition of the scrap before 

 rendering, did not average materially different from preceding years. It is pos- 

 sible to make scrap from sound stock which does not carry over 1.0 percent of 

 oleic acid, which is the standard of some feed mixers in selecting scrap as an 

 ingredient of feeds. It is quite possible that some material used would under 

 normal conditions have been made into fertilizer tankage. 



The protein quality index is determined by methods worked out by H. J. 

 Almquist* of the University of California. The purpose of the method is to 

 break up and determine the different components of what is analyzed as total 

 protein and to assign to these components their proper value in promoting growth. 

 Check tests made with chicks have proved the general accuracy of the method. 

 Experiments indicate that a meat and bone scrap of excellent quality should 

 have an index value of 70 to 75, one of good quality 65 to 70, and one of average 

 quality 60 to 65. A product with an index value of less than 55 may be con- 

 sidered low quality. Fish meal of highest grade may run as high as 80 to 87. 

 Fish meal produced from market scrap may run as low as 58. 



The protein quality index found is not particularly disturbing. While some 

 lots could have been of better quality, in the light of present shortages the samples 

 with few exceptions should be considered acceptable. 



Products Usually Sold as Vitamin Supplements 



With the exception of dried milk and dried whey, the products listed in this 

 table are added to rations primarily for the vitamins they furnish. It should be 

 understood that, although riboflavin and, in some instances, choline and carotene 

 are the only substances reported, they are not necessarily the only valuable consti- 

 tuents of the products in question, many of which contain other vitamins or min- 

 erals as well. Our examination was confined to those values that can be de- 

 termined b\- chemical methods. 



♦Supplementary Values of Animal Protein Concentrates in Chick Rations: Journal of Animal 

 Nutrition, Volume 10, July-December 1935. 



