66 



PROFITABLE DAIRYING 



ten months that a cow is in milk. If this be 

 true, then this weight multiplied by five will 

 give the average weight produced monthly, and 

 this monthly average multiplied by ten will give 



Fig. 20. Colleg-e Bravura 2nd. 

 A fine old Brown Swiss cow of marked dairy-type. 



the total amount of milk produced in ten months, 

 the number of months every good dairy cow 

 should give milk during the year. This total 

 amount of milk multiplied by the test will give 

 the yield of fat, to which one-sixth is added to 

 find the butter yield. This method is rapid and 

 fairly accurate. One example to illustrate: Sup- 

 pose a cow is found to give 100 pounds of milk 

 in six days during the fifth month of lactation. 

 Then 100X5X10 = 5,000 pounds of milk an- 



