EXPERIMENT STATION BULLETINS. 421 



CREDIT VALUES. 



In order to determine the net cost of the milk sold, the value of all 

 other products is subtracted from the gross cost of all milk produced. 

 The value of the credits for each year studied, as well as for each month 

 and season, is given in Tables XIII and XIV. Milk used on the farm, 

 milk returned from the milk plant, the manure and the calves comprise 

 the total credits. 



The methods for determining the quantity of manure produced are 

 given under the heading "Manure" on page 405. The average amount 

 per year of manure credited to the dairy cow for the three years at 

 Howell was 5,34 tons for the winter season and 2.195 tons for the sum- 

 mer season, making a total of 7.535 tons for the year. A value of |1.50 

 per ton was allowed the first year and |2.00 per ton thereafter, making 

 a total of Ill.GO for the first year, |15.08 for the second year and |14.76 

 for the third year. 



At Webberville this item amounted to G.97 tons per cow, valued at 

 110.46 for the first year, and 7.12 tons, valued at $14,24 for the second 

 year. 



All milk used on the farm was valued at the market prices less the 

 cost of hauling. Milk returned from the plant, due to poor condition, 

 was charged in at its feeding value. In some cases where farmers did 

 not have stock to which it could be fed, it was considered a total loss. 

 As a whole this was a very small item and amounted to only fifteen 

 cents per cow per year at Howell and seven cents per cow per year 

 at Webberville. 



A separate account was kept on feed bags sold during the last year's 

 work at Howell, This amounted to twenty cents per cow. Previous 

 to this year when feed bags were sold, their value was deducted from 

 the cost of feed. 



No value for calves is given. As previously stated, calves at birth 

 were offset by sire costs. 



The total value of the credits for the year amounted to |34.21 for 

 the first year, |49,18 for the second year, and |60.02 for the third year 

 per cow at Howell and |22.8S for the first year and |30.20 for the last 

 year at Webberville. 



COST OF MILK SOLD. 



No one factor tends to raise or lower the cost of production of milk 

 as much as does the quantity of milk produced. The average produc- 

 tion in the Howell field was 7,211 pounds per cow per year, ranging much 

 higher than the average production throughout the state which is esti- 

 mated at about 4,500 pounds. 



