120 FARM ANIMALS 
The movement of the arm is directly forward and backward. 
Horses cannot rotate their arms as can boys and girls. This is be- 
cause the horse does not have a collar bone. For the same reason, 
the horse cannot carry food to its mouth as can a squirrel. But the 
horse is fleet, because the backward and forward movement of the 
arm prevents lost motion. 
8. Body.—The body varies greatly with the service to 
which the horse is to be put. In the draft horse the body 
is much larger and rounder than in the trotting horse. 
The loin must be wide, short and thick, since all the force 
exerted by the hind members must pass through the loin. 
In a powerful draft horse the distance from the chest to 
the ground should not be greater than half the height of 
the horse. In trotting and running horses this distance 
may be 2 to 4 inches greater than that from the chest to 
the withers. This is a very important factor in the rela- 
tive power and speed of the horse. All horses should 
have well-sprung ribs, which are wide apart and extend 
well back so as to make the flank narrow and low. The 
THREE WELL-BopieD DRAFT HORSES 
Note the width and depth of the bodies. They show great force and power. The 
Jegs are no longer than the body is deep. 
