1 88 FEEDING FARM ANIMALS 



these variations produce corresponding variations in the re- 

 sults from feeding the same foods. (2) The inherent power 

 of animals of the same age and class to digest certain 

 foods also varies greatly, and with these variations the re- 

 sults obtained will correspondingly vary. (3) Foods vary 

 in their digestibility with variations in the soils on which 

 they grew, and with the mechanical and chemical condition 

 of the same, also with the degree of the development and 

 maturity, hence the constituents of these will not be in strict 

 accord with the chemical analyses given in feeding stand- 

 ards. (4) Some foods have a physiological influence which 

 is favorable or adverse to digestion, and this influence will 

 lead to even important variations from feeding rations in 

 equal chemical balance. (5) Adaptation or the want of 

 this in the relative proportion of bulky food and concen- 

 trates fed, will have an important bearing on the results ob- 

 tained from feeding them. And (6) the degree of succu- 

 lence in the ration has also a modifying influence. 



