FUNDAMENTALS OF FEEDING 229 



fed, and the feeder must be guided by the results of feeding 

 tests that indicate the feeding value of different foods. 



It has been shown, for example, that there is a difference 

 in the protein. Fowls require a certain amount of protein 

 in the ration, but to be effective in egg yield part of 

 that protein must come from animal sources. It is protein 

 just the same, but why there should be this difference in 

 feeding value between animal and vegetable protein is not 

 yet known. 



Experiments by Wheeler showed that an animal food ra- 

 tion for laying hens was superior to others in which all the 

 organic matter was derived from vegetable sources, and for 

 growing ducklings very much superior. In the case of 

 growing chicks where bone ash was fed in the place of ani- 

 mal food the results were equally satisfactory. (Geneva 

 Bulletin 171.) 



In New Jersey experiments (Bulletin 265) it was found 

 that : ' ' The addition of animal protein in the form of meat 

 scrap materially increases the efficiency of a ration 

 relatively high in vegetable protein, both for egg produc- 

 tion and for flesh growth, " and that: "Phosphoric acid 

 from an organic source (animal bone) is much more ef- 

 ficient than phosphoric acid from an inorganic scource. " 



ANALYSES OF FOWLS AND EGG* 

 (The analyses of the fowls include the feathers, bones, blood, etc.) 



Water Ash Protein grates Fat 



Hen 55.8 3.8 21.6 .. 17 



Pullet ' 55.4 3.4 21.2 .. 18 



Capon 41.6 3.7 19.4 .. 33.9 



Fresh egg. . 65.7 12.2 11.4 . . 8.9 



*Prof. W. P. Wheeler, Geneva (N. Y.) Station. 



Computing the Ratio. The nutritive ratio may be com- 



