Proceedings of Seventeenth Normal Institute 22 



Z— i 



or a difference in the ratio 1:G.7 in favor of digestion by cattle. 

 Likewise for nitrogen-free^extract, poultry digest, as compared to 

 cattle, in the ratio 100 : 120.3 ; whereas when compared to swine, 

 they digest n. f. e. in the ratio 100: 122.1, or a difference in the 

 ratio 1: 1.8 in favor again of cattle. Again, in the case of the 

 digestion of fat, poultry digest, as compared to cattle, in the ratio 

 100. 105.2, whereas when compared to swine they digest in the 

 ratio 100: 88.5, or a difference in the ratio 1: G.'3 in favor again 

 of cattle. It is evident from these figures that the digestion by 

 poultry more closely resembles that by cattle than it does that by 

 swine. 



A third method of comparison is made on the basis of seven 

 feeds, potatoes being omitted owing to the fact that they are quite 

 different in character from the dry grains and ground feeds. 

 Taking an average similar to the above, but using only the seven 

 grain feeds common to each group, we find : 



'Poultry 75.66 per cent 



Cattle 73.00 per cent 



Swine 77.86 per cent 



Protein . 



N. F. E. 



Fat, 



'Poultry 82.66 per cent 



Cattle 86.57 per cent 



Swine 87.00 per cent 



Poultry 71.33 per cent 



Cattle 75.00 per cent 



Swine 63.14 per cent 



On the basis of similar computations as presented for the last 

 named group of eight feeds, we find for the digestion of protein 

 a difference in the ratio 1 :0.6 in favor of swine ; for the digestion 

 of nitrogen-free-extract a difference in the ratio 1 :0.6 in favor of 

 cattle; and for the digestion of fat a diff'erence in the ratio 1 :GA 

 in favor of cattle. 



Our correlation is still present though not so marked, and it 

 would seem that if we were to judge from the available data we 

 could only conclude, because the exceptions to the rule are so. few, 

 that the coefficient of digestibility for the nutrients in the case 

 of poultry is more nearly like that for cattle than it is like that 

 for swine. 



