SUBSTITUTIONAL DIETING 



79 



It is desired to substitute some other foodstuffs for 

 half the oats, to give exactly the same total nutritive 

 value, whilst not falling much in total protein. 



Here it is evident that maize alone will not suffice, for 

 maize has a lower content of protein than oats. A mix- 

 ture of beans and maize, made up of 30 per cent, beans 

 and 70 per cent, maize, approximates fairly closely to 

 the nitrogenous value of oats, so that it is necessary 

 to find how much of this mixture would be required to 

 take the place of 10 lbs. of oats. 



Now, 100 lbs. maize has a starch-equivalent value of 80 (Table III.). 



• 70 80x70 



'U „ „ „ „ 100 ~ 



70 (Table III. 

 70x30 



Similarly, 100 lbs. beans 

 30 „ 



100 



= 21. 



Therefore 100 lbs. of the maize-beans mixture (70 lbs. maize 

 30 lbs. beans) has a starch-equivalent value of 77. 



Again, 100 lbs. oats has a starch equivalent value of 60 (Table III.) 

 10 „ „ „ „ 6. 



But 77 represents the value of 100 lbs. maize-beans mixture. 



100x6 



= 7*79 lbs. maize-beans mixture. 



