11.   New Smithfield Lean Generation pork tenderloins are the result of English hogs being flown to the United States and used for selective breeding.

12.   Others are species that scientists are tailoring for the purpose by selective breeding or cross-breeding for salt-tolerance genes.

13.   Over many generations, human selective breeding has produced dogs that are keenly sensitive to their owners.

14.   Selective breeding of farm animals to enhance commercially useful traits is as old as human history.

15.   Seed companies are sought for their sales networks and their valuable portfolios of hybrid varieties, often cultivated through decades of selective breeding.

16.   So early domestic horses were not the result of selective breeding, the researchers say, but rather the result of a more haphazard process over many years.

17.   That has been achieved through selective breeding, Hines said.

18.   The alternative to selective breeding of individuals was a concerted physiochemical investigation of the gene.

19.   The distinctive character of Lassie, however, sustained via selective breeding by the family of original trainer Rudd Weatherwax, would seem to fit any situation.

20.   The domesticated turkey had become an ungainly creature, thanks in part to selective breeding by turkey producers.