Feeding Standards Calculating Rations. 



123 



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

 Ibs. 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 Ib. 



Energy 5.60 therms 



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

 in addition to the above : 



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



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 Ibs. milk daily. 



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

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



Calculations for trial ration for dairy cow. 

 Corn forage Clover hay 



In 100 

 pounds 



In 12 

 pounds 



Dry matter 57.8 -5-100x12=6.94 



Dig. protein _._ 2.13-5-100x12=0.26 

 Energy value .. 30.53-5-100x12=3.66 



In 100 

 pounds 



In 6 

 pounds 



Dry matter 84.7 -*- 100x6=5. 08 



Dig. protein .... 5. 41-5-lOOx 6=0. 32 

 Energy value ... 34. 74-5-100x6=2. 08 



Corn meal 



In 100 

 pounds 



In 5 

 pounds 



Dry matter 89.1 -f- 100x5=4. 46 



Dig. protein.... 6.79-5-100x5=0.34 

 Energy value ... 88. 84-5-100x5=4. 44 



Wheat bran 



In 100 

 pounds 



In 2 

 pounds 



Dry matter 88.1 -5-100x2=1.76 



Dig. protein 10. 21-5-100x2=0. 20 



Energy value ... 48. 23-5-100x2=0. 96 



