364 Animal Husbandry 
ratio of 1:5.5. Approximately one-third of the dry matter should 
be grain, one-third should be silage, and one-third should be hay. 
What is the cost of the ration with foods at prices given? 
22. Cost or MILK 
Object. To determine the cost of milk production. 
Materials. Dairy herd and a pair of scales. 
Directions. Weigh the food consumed by a cow and the milk 
she yields one day each month during the lactation period. Mul- 
tiply the food consumed and the milk yield that day by the num- 
ber.of days in the month. Keep this record from month to month. 
On weigh days take a sample of the milk and test for butter fat 
(see Exercise 27). Calculate the pounds of fat given for the month. 
Calculate the cost of food each month, using prices obtained from 
the local grain dealer. You have the food consumed, its cost, the 
milk flow, and the butter fat by months. 
23. Removinc Horns 
Object. To remove horns without injury to the animal. 
Materials. A calf under three weeks of age; a stick of caustic 
potash; a pair of shears. 
_, Directions. See page 153. 
24. PLaNs FoR A Cow BARN 
Object. To learn the general arrangement and space required 
in a cow barn. 
Materials. Drawing materials. 
Directions. Show ground plan, outside dimensions of barn, 
including silo, also dimensions and arrangements of stalls, feed 
rooms, milk room, and the like. Estimate the cubic space for each 
animal. How much silage space would you provide for each ani- 
mal? 
