THE EARTH'S BOUNTY 



often inferior in their yield of valuable market 

 products. The pure-bred animal, possessing 

 the qualities desired and the power of strongly 

 and surely transmitting them, is crossed upon 

 the common stock, and the result is usually 

 great improvement. The prepotency of the 

 pure-bred animal gives him power of affect- 

 ing the qualities of the offspring to far greater 

 extent than his mate. 



" Note how rapidly the pure blood increases 

 if in the process the offspring of each genera- 

 tion are bred with pure bloods each time. 



The first cross has pure blood. 



" second " " 



" third " I " 

 " seventh " 



" With the second cross comes the question 

 of interbreeding, i.e., the breeder must decide 

 whether he will breed the daughter to her sire, 

 or make use of another male of the same breed 

 as the sire. 



' When by crossing with superior animals we 

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