398 THE FEEDING OF ANIMALS 



faster than the amount of work done, and that an old 

 animal generally demands higher feeding than does a 

 young one. The condition of the road, the intensity of 

 the effort, and other circumstances also modify the needs 

 of the working horse, so that the feeder is always called 

 upon to exercise the trained judgment which comes from 

 experience. No working animal can be fed successfully 

 by mechanical rules. 



