246 THE CHEMISTRY OF CATTLE FEEDING 



of the other three that can be used along with it can be 

 calculated. 



It usually happens that the quantity of one or more of the 

 foods is or can be fixed. Considerations of expense, the 

 health of the animals, and so on, are the deciding factors. 

 It is, therefore, as a rule, merely a matter of calculation to 

 discover in what proportions the foods should be combined 

 to satisfy any given conditions. 



