It is certain that he can largely influence the character of a breed by selecting, in each successive generation, individual differences so slight as to be inappreciable except by an educated eye.
Egia da gizakiak eragin handia izan dezakeela arrazaren ezaugarrietan belaunaldi bakoitzean, begi arituarentzat izan ezik hautemangaitzak izan ohi diren ezberdintasun txiki indibidualak hautetsiz.