Although I do not doubt that some domestic animals vary less than others, yet the rarity or absence of distinct breeds of the cat, the donkey, peacock, goose, etc., may be attributed in main part to selection not having been brought into play:
Etxe-animalia batzuk beste batzuk baino gutxiago aldatzen direla inolako zalantzarik ez dudan arren, hala ere, katuaren, astoaren, paumaren, antzarraren eta abarren arraza ezberdin gutxi edo bat bera ere ez izatea hautespenik erabili ez izateari zor izan dakioke: