32 NUTRITION OF FARM ANIMALS 



TABLE 4. CLEAVAGE PRODUCTS OF PROTEINS * 



The results shown in the foregoing table are typical. In a 

 few proteins, certain amino acids have not been found at all. 

 For example, no glycin has been found among the products of 

 the hydrolysis of gliadin, zein, albumin or casein and no lysin 

 among those of gliadin or zein. Furthermore, the proportion of 

 the various cleavage products is quite variable in the different 

 proteins, one of the most striking instances being that of glu- 

 tamic acid which ranges from nearly 44 per cent in the gliadin 

 of wheat to a little over 9 per cent in egg albumin, and is no- 

 tably more abundant in vegetable than in animal proteins. 



51. Classification. For the present purpose, it seems super- 

 fluous to enter into a full description of the various simple pro- 



1 The sign + signifies that the substance was present but was not quantitatively 

 determined. A blank simply indicates that the ingredient in question was not 

 determined but does not show that it was not present. 



