TRIAL RATION 



75 



The addition of i pound of new-process oil meal makes 

 the second trial ration too high in all nutrients, — the ex- 

 cess being most noticeable in digestible carbohydrates and 

 fats. If two pounds of oat straw are deducted, the third 

 trial ration appears as follows : 



Third trial ration 



The third trial ration falls below the standard by 1.146 

 pounds of dry matter, which is unimportant; o.ooi pound 

 of digestible protein, which is insignificant; and 0.243 

 pound of digestible carbohydrates, which is offset by an 

 excess of 0.1 18 pound of digestible fat. 



Thus a satisfactory ration for a 1000 pound steer at 

 rest might consist of 10 pounds of timothy hay, 8 poimds 

 of oat straw, and i pound of new-process oil meal. 



It is practically impossible to keep the fat of the ration 

 as low as the standard requirements, but since carbo- 

 hydrate and fat material are both sources of energy and 

 fat for the animal, these two nutrients may interchange 

 in the ration. So long as the protein suppUed in the ra- 

 tion is near to the requirements of the standard and the 

 nutritive ratio of the ration is close to that of the standard, 

 it matters little if the fat content is high. Neither is it so 



