240 



VETERINARY PHYSIOLOGY 



but in drawing a heavy load the step is shortened and the 

 toe reaches the ground first. , 



The speed attained in walking is usually about 4 miles 



Fig. 121.— The Walk. 



per hour. Among draught horses the greatest speed is got 

 in the Clydesdale, which has been bred largely for the quality 

 of the feet and legs. 



Trot. — The body is driven forward by the alternate pro- 

 pulsive action of the diagonal fore and hind legs. The off 



Fig. 122.— The Trot. 



fore and near hind feet leave the ground together, propelling 

 the body upwards and forwards (fig. 122, 1), and are then 

 advanced to again reach the ground, when the near fore and 

 off hind feet repeat the same movements (3). 



