72 How to Make Creamery Butter on the Farm 



cow's product. Have as your ambition a yearly av- 

 erage milk yield of more than 4,000 pounds per cow. 



Most dairymen who have taken this as their aim 

 have surpassed this point. 



And it pays. 



What Grading Has Done in Other Instances. 



We quote the following from a table compiled to 

 show how experience has proved that a pure-bred 

 sire will grade up a mixed or common herd of cows 

 into practically pure-bred dairy animals : 



Calves of first generation contain 50 % pure blood. 

 Calves of second generation contain 75 % pure blood. 

 Calves of third generation contain 87.5% pure blood. 

 Calves of fourth generation contain 93.75% pure blood. 

 Calves of fifth generation contain 96.87% pure blood. 

 Calves of sixth generation contain 98.43% pure blood. 



Therefore it will be seen that the sixth generation 

 is practically 99 per cent pure. 



It might be stated here that when conditions have 

 been favorable, animals of the fourth generation are 

 hard to distinguish from absolutely pure-bred cattle. 

 This shows that a pure bred sire will impress the traits 

 of his breed upon his offspring within four generations, 

 as a rule. 



It is only from pure-bred sires that you can expect 

 results like this. 



If you will write to Cornell University, Ithaca, New 

 York, the authorities there will be very glad to send 

 you a bulletin giving the history, care and feeding of a 

 speciaf herd on which this method of grading up the 

 herd was used. 



