FEEDING STANDARDS CALCULATING RATIONS 119 



ments. Since the standard calls for 18 Ibs. of dry matter, we will first 

 try quantities of these feeds which supply approximately this amount. 

 If for the trial ration it is decided to feed 10 Ibs. of corn stover and 10 

 Ibs. of oat straw for roughage, then, using the values for digestible nu- 

 trients given in Appendix Table III, the calculations for dry matter and 

 digestible nutrients would be as given below: 



Corn stover, field-cured 



In 100 

 pounds 



In 10 



pounds 



Dry matter 59.0-5-100X10 = 5.90 



Crude protein 1.4-5-100X10=0.14 



Carbohydrates 31. 1-5-100X10=3.11 



Fat . 0.6-5-100X10=0.06 



Oat straw 



Dry matter 88.5-5-100X10 = 8.85 



Crude protein 1.0-5-100X10=0.10 



Carbohydrates 42.6-5-100X10=4.26 



Fat 0.9-5-100X10=0.09 



Arranging these results in tabular form, we have: 



First trial ration for maintaining 1,000-lb. ox at rest 



This trial ration contains only about one-third the digestible crude 

 protein called for and also falls below the standard in dry matter and 

 carbohydrates. To improve it let us substitute 5 Ibs. of clover hay, 

 which is high in protein, for the same weight of corn stover, and add 0.5 

 Ib. of protein-rich linseed meal. We then have: 



Second trial ration for maintaining 1,000-lb. ox at rest 



