DAIRYING. 



37 



100. It cannot be expected that the cost of keeping a cow 

 giving 10,000 pounds of milk per year will be the same as that of a 

 cow giving 3,000 pounds of milk. The difference, however, will be 

 mostly covered by the feed consumed, as the other expenses of 

 stable, labor, etc., are approximately uniform, excepting that the 

 annual interest and depreciation in the value of the cow may be 

 somewhat different. The figures are of importance, however, as 

 they show the approximate cost of the milk to the owner of cows 

 producing different amounts of milk per year. According to these 

 figures, with a cow giving 5,000 pounds of milk the cost of the milk 

 is $1.00 per 100, or 2 cents per quart, and unless it is sold for a 

 higher price or the expenses of keeping the cow are reduced, the 

 owner will receive no profit for his labor and his money invested 

 in such a cow. 



The Creamery or Buttermaking Value of the Milk. 



101. A calculation similar t othe one given above may be made 

 for estimating the value of different amounts of milk produced 

 per cow per year when the milk or cream is either sold to a cream- 

 ery or is used for making butter at the farm. Under such circum- 

 stances, the value of the milk is found by adding the value of the 

 skim milk to that of the pounds of butter made from the cream. 

 Assuming the average test or per cent, of fat in all the milk to be 

 3.5 also that the skim milk is 80 per cent, of the whole milk, and 

 this skim milk is worth 30 cents per 100 pounds, and the overrun 

 is 16 per cent, the value of the different amounts of milk on a 

 butter basis may be calculated for one year. Taking for example, 



