Feeding Standards — Calculating Rations. 



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To form a ration for a dairy cow weighing 850 lbs. and yielding 20 

 lbs. of milk daily, suppose there are available field-cured corn forage, 

 clover hay. corn meal, wheat bran, and gluten feed. 



The maintenance requirements for an 850-lb. cow are approx- 

 imately : 



Digestible protein 0.45 1b. 



Energy 5.60 therms 



For the production of 20 lbs. of 4 per ct. milk there is needed 

 in addition to the above : 



Digestible protein (0.05 lb. x 20) 1 lb. 



Energy (0.3 therms X 20) 6 therms 



The total daily feed requirements are therefore as follows : 



Feed requirements of an 850-lb. cow producing 20 lbs. milk daily. 



For a trial ration we take 12 lbs. of corn forage, 6 lbs. of clover 

 hay, 5 lbs. of corn meal, and 2 lbs. of wheat bran. 



Calculations for trial ration for dairy cow. 

 Corn forage Clover hay 



Energy value... 88.84-^100x5=4.44 Energy value .. . 48. 23 -i- 100x2=0. 



