INSPECTION OF COMMERCIAL FEEDSTUFFS 



By Feed Control Service Staff 



John VV. Kii/mcski, Research Professor, Official Chemist 



Albert F. Spelman, Associate Research Professor 



C. Tyson Smith, Associate Research Professor, Microscopisl 



Bertram Gersten. Assistant Research Professor 



David F. Owen, Jr., Research Instructor 



Shirley J. Richards. Research Instructor 



Josepli Conklin. Inspector 



Edward F. Vlach, Technical Assistant 



Paul Korpita, Laboratory Assi iant 



Doris .A. Kennedy, Senior Clerk-Stenographer 



INTRODUCTION 



There is an increasing awareness among federal and state control officials, 

 feed and drug manufacturers, and others concerned, of their responsibilities to the 

 consumer in regard to the use of drugs in mixed feeds. Because of the accelerated 

 pace in the appearance of new drugs, some uneasiness exists with the thought that 

 perhaps this phase of feed manufacturing is moving too swiftly to permit the exer- 

 cise of proper controls. 



An examination of the data presented in this bulletin shows results of deter- 

 minations for twenty-five drugs in mixed feeds. These do not represent all of the 

 drugs currently used. 



For most state control laboratories the adequate checking of feed* for all drugs 

 guaranteed is becoming a serious problem. It means either an expanded laboratory 

 force or a curtailment in the number of samples analyzed. 



For some drugs the lack of suitable assay methods for routine analysis is a 

 disturbing factor. Since the margin between effective and toxic levels for some 

 drugs is relatively narrow, reliable analytical methods are necessary. 



Change is inevitable and progress will not be stayed in the feed business as 

 elsewhere. But when the pace gets so fast that feed maufacturers, regulatory 

 services, and others cannot keep up, and the rapidity of change completely outstrips 

 control methods, danger can lie ahead. Sometimes a light application of the brakes 

 is not onlv beneficial but necessary to prevent what might become a headlong race 

 to disaster. 



Apple Pomace and Citrus Pulp 



During the past year several samples of Apple Pomace, wet and dried, have 

 been analyzed. 



The Dried .\pple Pomace was found to contain up to 56 parts per million DDT, 

 35 parts per million lead, and 7 parts per million arsenic. The wet pomace contained 

 up to 7 parts per million DDT. 



Neither the wet nor the dried pomace is suitable for feeding to dairy cattle, 

 since the DDT would appear in the milk. The dried pomace with a high DDT and 

 lead content is unsuitable for feeding to any animals. 



