New York Agricultural Experiment Station. 



533 



pounds of the same class may cause actual differences in the rela- 

 tive eflSciency of two rations combined from unlike foods, but 

 similar in aimount of digestible material and nutritive ratio when 

 calculated on the basis of average composition and digestibility. 

 The writer is not aware that any comparison has so far been 

 made of the calculated and the actual digestibility of rations, nor 

 between the nutritive effect of the two rations with especial refer- 

 ence to the points which are discussed in this connection. 



The Calculated and the Actual Digestibility of Two 

 Rations. 



Two rations quite unlike in origin were selected for an experi- 

 ment by this Station. In one the proportion of timothy hay was 

 large and the grains were entirely by-products. In the other 

 corn silage was freely used and the grains were entirely ground 

 oats and ground peas. The hay, silage and oats were home 

 grown and the other materials were of the usual commercial 

 grade. Without knowing the composition of these feeding stuffs, 

 the digestible nutrients they would supply were calculated from 

 the averages of feeding tables. 



Average Composition and Digestibility of Certain Feeding Stuffs. 



* Jenkins <fe Winton. t American excepting those for oats. 



I Rep. Mass. Station, Jan., 1897. 



t Wisconsin analyses. 



