328 POULTRY PRODUCTION 



In order to determine such matters much careful exi)criniental 

 work is sorely needed. 



A further reason lies in the fact the nutritive ratio of a 

 feed or ration gives no information concerning its vitamin 

 content, the importance of which is increasingly apparent. 

 It would be easily possible to prepare a ration in which the 

 relative proportion of proteins to carbohydrates and fats was 

 highly satisfactory, yet fowls fed on it would die for lack of 

 one or both of the vitamins. 



