80 



THE ECONOMICS OF FEEDING HORSES 



In other words, 10 lbs. of oats can be substituted by 

 7f lbs. of maize-beans mixture ; thus — 



If the prices of oats, maize, and beans are 17s. 6d. for 

 320 lbs., 25s. for 480 lbs., and 33s. for 504 lbs. respec- 

 tively, the saving effected by the substitution is as shown 

 below — 



20 lbs. oats cost 13-124d. 



10 lbs. oats cost 6-562d. 



7*78 lbs. maize-beans mixture ... 5-249d. 



ll-811d. 



.'. saving = 13-124-ll'811d. = l-3d. per horse per day; or in 

 feeding 100 horses, a saving of ^197 14s. a year. 



These examples serve, then, to show the methods to be 

 adopted in substituting one food in a ration by another, 

 and by means of the tables included in this volume the 

 calculations necessary are reduced to a minimum. 



It must be remembered that the idea of the equivalent 

 value of two foods in terms of any common unit (such 

 as 1 lb. digestible starch, the unit used throughout these 

 pages) can be carried too far, and before attempting any 

 substitution. Chapter VI. on " A Suitable Kation " should 

 be carefully read. 



