688 NUTRITION OF FARM ANIMALS 



thus involved tends to make the protein content of the rations 

 somewhat higher than if the crude protein were made the basis 

 of the computation. It is, therefore, an error on the safe side, 

 since a deficiency of protein may limit production while a sur- 

 plus at worst simply tends to increase the cost of the ration, and 

 the difference in the latter respect is seldom considerable. 



