196 



AGRICULTURAL EXPERIMENT STATION. 



Digestibility of Protein by Pepsin-Pancreas Digestion. 







In water free substance. 



C3 



» . 

 W)T3 

 o s 



•- o 



11 



-a 





S 



Oi 



a 



o 



o 



'a 



o 



'3 • 



o o 



"a §, 



^ a 

 --. a, 



Undigested by 

 pepsin pancreas 

 digestion. 



o 



g 



a 



s 

 -a 



? s 



XXIV.... 





1886 

 1887 

 1887 

 1887 

 886 

 887 

 1887 

 886 

 887 

 887 

 887 

 887 

 887 

 887 



1.81 

 2.32 

 2.76 

 1.61 

 .63 

 1.35 

 1.55 

 1.07 

 1.31 

 1.25 

 1.20 

 1.52 

 1.62 

 1.49 



2.02 

 2.32 

 1.42 



1.29 



1.17 



1.08 

 1.39 

 1.53 

 1.40 



.87 

 .457 

 .502 

 .525 

 .344 

 .393 

 .557 

 .464 

 ,338 

 .465 

 .414 

 .325 

 .391 

 .398 



52.0 

 80.3 

 81.8 

 67.4 

 45.6 

 70.9 

 64.1 

 56.5 

 74.2 

 62.8 

 65.5 

 78.7 

 75.9 

 73.3 





XLI 



» - 



77-. 4 



XLII 



White 



78.4 



XLIII... 

 XXVII . . . 



Blue joint 



63.0 



XL 



L 



Orchard grass 1 



Red Top 



69.6 



XXIII.... 



Timothy 





XLIV .... 



'« ] 



71.1 



LI 



<« ] 





XLV 



XXXIX . . 



Wild oat grass 



Witch grass 1 



61.7 

 76.6 



XLVI .... 



Buttercup ] 



74.5 



XLVII . . . 





71.5 









A Comparison of Methods for the Determination of the 

 Digestibility of Protein. 



A reference to the coefficients of digestibility previously given 

 shows that the coefficients of digestibility for protein differ in a 

 marked manner as determined by the natural and artificial methods. 

 The latter method gives coefficients from 3.7 to 51. per cent higher 

 than the former, as is shown in a subsequent table, where the two 

 sets of figures are placed side by side. In one instance only does 

 the artificial digestion give a lower result. It is important to know 

 the cause of these differences. On the one hand we have the long 

 confessed inaccuracy of considering the nitrogen of the feces as 



I 



