74 FARM ARITHMETIC. 



and to furnish energy and fat. Fat or adipose tissue is 

 Nature's way of storing energy and warmth for future 

 use. 



A good dairy cow will yield in one year 6,600 pounds 

 of milk, in which there are : 



5,670 pounds of water, 

 50 pounds of ash, 

 220 pounds of casein and albumen (protein), 

 284 pounds of fat. 

 376 pounds of milk sugar. 

 These substances are practically all digestible. 



174. What is the percentage of water in milk? 



175. The percentage of ash? 



176. The percentage of protein ? 



177. The percentage of fat? Compare these values 

 with table on page 61. 



178. The percentage of milk sugar? 



179. How many pounds of water in a ton of milk? 



180. How many of ash ? 



181. How many of protein? 



182. How many of fat? 



183. How many of sugar? 



184. When a cow yields daily 25 pounds of milk which 

 tests 4.3 per cent butter fat, what quantity of butter fat 

 is produced? 



185. A dairyman has 25 dairy cows in his herd. Ten 

 yield 40 pounds each daily ; ten, 30 pounds ; and five 20 

 pounds. The milk averages 3.8 per cent butter fat. What 

 is the total quantity of butter fat produced? 



