326 



POULTRY PRODUCTION 



The pullets fed the animal-food ration consumed 13 per 

 cent, more feed and laid 30 per cent, more eggs than those 



Fig. 173 



Ducks receiving no animal protein. Notice comparative number and siae. 

 (Courtesy of W. P. Wheeler.) 



restricted to protein of vegetable sources, while the old 

 hens having the animal protein consumed 15 per cent, more 

 food and laid 36 per cent, more eggs. 



Fig. 174 



Ducks receiving animal protein. (Courtesy of W. P. Wheeler.) 



There is much further evidence bearing out the above 

 from numerous sources. 



A possible partial explanation of this may be in the fact 

 that the protein in the plant is surrounded by cellulose, 



