28 SCIENTIFIC FEEDING OF ANIMALS 



During the period of experiment the animals are 

 kept in specially constructed stalls or boxes, and 

 the dung collected in bags lined with india-rubber 

 and attached to the body in such a way that the 

 solid and liquid excreta are kept separate. The 

 urine passes by means of an india-rubber funnel and 

 tube to a bottle underneath the stall. The part of 

 the food which has been digested is then found by 

 deducting the ingredients of the faeces from those 

 of the original food. An example will serve to 

 make this clear. An ox was fed daily with 9 kilos 

 meadow hay, which contained 81-22% dry matter, 

 and during the fifteen days which the experiment 

 lasted there was an average daily yield of 18-008 kilos 

 dung which contained 17-43% dry matter. 



The chemical analysis gave the following per- 

 centage composition for the dry matter of the hay 

 and of the faeces — 



The amounts digested are calculated to be — 



Dry Organic Crude Nitrogen-free Crude Crude 



matter. matter. protein. extract. fat. fibre, 



kilos. kilos. kilos. kilos. kilos. kilos. 



Meadow hay 7-303 6-815 0-684 3*8oi 0-153 2-177 



Dung . . 691 2-792 0-342 1-453 0-086 0-911 



Digested . 4-164 4-023 0-342 2-348 0-067 1-266 



Amount digested per 100 parts — 



57-0 59-0 50-0 61 -8 43*8 58*2 



