RATIONAL FEEDING OF ANIMALS 359 



Problem 5. Calculate a ration for a dairy cow giving a full flow 

 of milk. 



Problem 6. Calculate a dairy ration for average milk yield. 



Problem 7. Calculate a ration for a sheep weighing 100 pounds. 



Problem 8. Calculate a ration for a growing steer weighing 500 

 pounds. 



Problem p. Calculate a ration for a I2oo-pound steer, fattening 

 period. 



483,. Comparative Cost and Value of Grains. The 



market value of grains frequently differs from their actual 

 food value. That is, a given sum of money if invested 

 in one food article will often procure a larger amount of 

 digestible protein and other nutrients than if invested in 

 other foods. To illustrate : If corn is 50 cents and oats 

 30 cents per bushel, $1.00 will purchase either 112 pounds 

 of corn or 107 pounds of oats. Which is the cheaper and 

 more valuable for feeding purposes ? The digestible 

 nutrients in 100 pounds of corn and oats are as follows : 



Digestive nutrients. Pounds per hundred. 



Protein. Fat. Carbohydrates, etc. 



Corn 7.9 4.3 66.7 



Oats 9.2 4.2 47.3 



The amounts of digestible nutrients in 1 1 2 pounds of 

 corn and 107 pounds of oats obtained by multiplying by 

 the per cent, of digestible nutrients are : 



Carbohy- 

 Pounds. Protein. Fat. drates. Calories. 



Corn 112 8.85 4.82 74.7 175,684 



Oats 107 9.84 4.50 50.6 I3M07 



There is a difference of about i pound of digestible 

 protein in favor of the oats and 24 pounds of digestible 

 carbohydrates in favor of the corn; the dollar's worth of 



