M 



,rV. 



hiil 



^^i^ ,, ^^'■h^'' 





-r*^ 



^:y4«; 



Analyzing feed for fat, fiber, and protein content, 

 bag of feed sold pays for an analysis. 



Less than a cent for each 100-pound 



jected on the recommendation of 

 the Control Service. 



It is fortunate that the manufac- 

 turers of laboratory equipment have 

 kept pace with the requirements of 

 the analytical chemists. If it were 

 not for some of the modern analy- 

 tical tools that the Control Service 

 has, it would not be possible to fur- 

 nish the service now rendered with- 

 out greatly increasing the number 

 of chemists. Considered invaluable 

 is such equipment as the Beckman 

 Quartz Spectrophotometer which 

 has an ultraviolet light attachment 

 for the determination of vitamin A, 

 a fluorescence attachment for ribo- 

 flavin determination, and a flame 

 photometer attachment for the de- 

 termination of minerals in feeds and 

 fertilizers. Other equipment, such 

 as the electrometers and stereoscopic 

 microscopes, enable the control 

 chemist to obtain not only quicker 

 results but also more accurate de- 

 terminations. The C(jntrol Service 

 is constantly seeking better analyti- 

 cal methods that can be adapted to 

 feed and fertilizer control work. 



Advances Bring More 

 Problems 



We have mentioned some of the 

 problems with which the control 

 official is confronted as the result of 

 advances in the field of animal nu- 

 trition. Although the appearance 

 of the new drugs, vitamins, and 

 other dietary factors has presented 

 the control official with analytical 

 problems, the feed manufacturer is 

 faced with perhaps even greater 

 problems involving mixing and 

 keeping qualities and handling of 

 some of these materials. Unless the 

 manufacturer of mixed feeds buys 

 accurately pre-mixed supplements 

 or concentrates, he will have the 

 problem of properly blending the 

 minerals, vitamins, and drugs with 

 the usual feed ingredients. To ob- 

 tain a uniform feed mixture requires 

 not only costly equipment but also 

 the technical "know-how" to oper- 

 ate such equipment efficiently. 



(continued on page 15) 



