354 SCIENTIFIC FEEDING OF ANIMALS 



In Table II no digestibility coefficients are given 

 for pure protein, but nevertheless numbers can 

 be calculated ; it is only necessary to subtract the 

 amount of amides from the digestible crude protein. 

 To find what quantity of amides are present the 

 digestible protein shown in column 12 of Table I 

 is subtracted from the digestible crude protein given 

 in the same Table (column 7). The digestible nutri- 

 ents in the food-stuff are then the basis for the 

 calculation of the starch equivalent. It is : — 



1 part digestible protein . . =0*94 parts starch equivalent 



1 part digestible fat in the coarse 

 fodders, chaff, roots, and 

 their by-products . . =1*91 „ „ „ 



In grains and their by-products, 



exclusive of oily seeds . = 2"i2 „ „ „ 



In oil seeds and oil cakes . =2*41 „ „ „ 



1 part digestible nitrogen-free 

 extract substances and 

 crude fibre together . = roo „ „ „ 



If the nutrients of the particular food-stuff can 

 be regarded as of " full value," which can be seen 

 by reference to the data in Table I regarding 

 similar or allied foods, then all that is necessary is 

 to add together the equivalents, as shown above, of 

 the three groups of nutrients, and obtain the total 

 starch equivalent. If the value of the food is 

 shown by Table I to be less than 100, a deduction 

 depending upon the different feeding-stuffs has to 



