l82 ELEMENTARY TREATISE ON STOCK FEEDS AND FEEDING 



TABLE V .—{Continued.) 

 Estimated Energy Value of i Pound of Gain in Weight 



How to Compute the Requirement. — Let us compute a ration 

 for a dairy cow weighing 875 lbs., producing 25 lbs. of milk 

 daily. 



Referring to Table V we find the maintenance requirements 

 for cows weighing 750 lbs. and 1,000 lbs. are: 



750 lb. cow 1,000 lb. cow 



Digestible protein, pounds 0.40 0.50 



!^nergy, therms 4.95 6.00 



The difference between 875 and 1,000 is the same as the dif- 

 ference between 750 and 875. Therefore the maintenance re- 

 quirement for a cow weighing 875 lbs. is : 



Digestible protein 0.45 pound 



Energy 5-475 therms 



For the production of 25 lbs. of milk we would need accord- 

 ing to Table V: 



Digestible protein (25 X 0.05) ^= 1.25 pounds 



Energy (25 X 0.3 ) = 7.50 therms 



The total requirement then is: 



Digestible Energy 



protein value 



pounds therms 



Maintenance 0.45 5-475 



Milk production 1.25 7-5oo 



Total requirement =1.70 12.975 



