408 Feed^ and Feeding. 



may be placed at about nine per cent, of the yield for the preced- 

 ing month. The actual average yield of a herd and the theoret- 

 ical yield, according to this factor, appear in the following 

 table: 



Monthly decrease in milk flow of dairy cows, actual and theoretical — 



Sturtevant. 



In the table given above, the theoretical yield for each month 

 was obtained by subtracting nine per cent, of the yield for the 

 previous month from the yield for that month. We observe that 

 the actual yield agrees closely with the theoretical in showing the 

 possible yield of milk by the cow in any given month. 



623. Heavy feeders may be the most profitable. — At the Penn- 

 sylvania Station, ^ Waters and Hess, studying the returns from 

 nine cows in the Station herd during a trial lasting 150 days, se- 

 cured important data relative to the food consumed and the yield 

 of butter. Cows which had been tested the previous year were 

 used in this trial. Some of these had excellent butter records, 

 while others were of average or low productive power. All were 

 fed liberally according to their capacity for consuming food, 

 llecords were kept of consumption and production. 



In a table prepared by these investigators are summarized the 

 butter yielded by each cow the preceding season, the cost of the 



Rept. 1895. 



