TABLES — READY RECKONER EXAMPLES 103 



it would not pay to buy maize at anything over 34s., for 

 otherwise each nutritive unit in the form of maize 

 would cost more than nutritive units in the form of 

 oats. 



Table VIII. is useful in determining the cost of a 

 ration. It shows the cost of 1 lb. of various foods 

 when the price per quarter, etc., is known. 



Table IX. is of great assistance when finding the 

 nitrogenous ratio of a complete ration. For each food 

 is shown the amounts of (1) digestible protein, (2) other 

 digestible nutrients (reckoned in terms of starch), in 1 lb. 

 of the food. To find the nitrogenous ratio of a mixed 

 ration, all that is necessary is to multiplty the " protein " 

 and "non-protein" amounts for each ingredient by the 

 number of lbs. of that substance fed. The ratio is then 

 stated as — 



Total digestible protein N 



Total digestible nutrients other than protein' ' F x 2*3 + C.H. + D.F. 



The foUowingr example is appended to show the 

 method of using the tables for the purpose of calculating 

 the real value of a ration, and of substituting more expen- 

 sive by less expensive foodstuffs of equal nutritive 

 value : 



A stud of 100 horses used for trotting work in town 

 (each horse weighing on an average 1,200 lbs.) is fed on 

 the following daily ration : Oats, 14 lbs. ; bran, 5 lbs. ; 

 chaff (meadow hay), 14 lbs. per horse. 



Questions : (1) Is the ration sufficient for severe work 

 in winter? (2) If insufficient, what foodstuffs can be 

 given to provide sufficient nutrients at the lowest 

 cost? 



