Bui. 561, U. S. Dept. of Agriculture. 



Plate I. 



Fig. 1.— Pen 2, Mixed Pen of General-Purpose Breeds. 

 On free range; fed a ration without oats. 



Fig. 2.— Pen 4, Single-Comb White Leghorns. 

 On free range; allowed to select their own mash. 



