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 -4-100x12=6.94 

 Dig. protein ... 2. 13+- 100x12=0. 26 

 Energy value . . 30. 53-*- 100x12=3. 66 



In 100 

 pounds 



In 6 

 pounds 



Dry matter 84. 7 -5- 100 x 6=5. 08 



Dig. protein .... 5. 41-^-100x6=0. 32 

 Energy value... 34.74-4-100x6=2.08 



Corn meal 



In 100 

 pounds 



In 5 

 pounds 



Dry matter 89.1 -5-100x5=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 



