SELF-FEEDIN G HOPPERS 153 
Fia. 101.—Common types of feeding troughs. a, Open V-shaped; b, square form; 
¢c, V-shaped, covered. 
hoppers designed to feed whole grain automatically do not induce 
sufficient exercise. They supply grain too liberally unless they 
become clogged. 
The pens should be visited often enough to Supply the grain 
ration in litter. 
It should be of large capacity, thus €conomizing labor in filling, 
A hopper holding from two to four bushels wil] not require filling 
