selective breeding
noun
                                
              
          
                                                      : the process of modifying the characteristics of living things especially to enhance one or more desirable traits by selection in breeding controlled by humans                                      
              
                             
After about three years of selective breeding, their company, Cavendish Game Birds, was able to deliver quail that consistently dressed out to seven or eight ounces.—
Warren Schultz
                                       Selective breeding continues in an attempt to enhance the human use of this economic plant against a background of disappointingly low rubber content …—
John M. Miller and Ralph A. Backhaus
                                       Fixed through selective breeding, traits could vanish over several generations if people became careless in choosing their dogs' mates.—
Mark Derr
                         
                called also artificial selection
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  Merriam-Webster unabridged




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