What this suggests is that, at some point in the domestication of the chicken, a selective sweep, probably driven by human intervention, subtly changed the reproductive machinery of the bird, presumably to the advantage of its human manipulators.
Isto indica que en certo momento da domesticación das galiñas, un varrido selectivo, probablemente pulado pola intervención humana, cambiou sutilmente a maquinaria reprodutora da ave, seguramente para proveito dos seus manipuladores humanos.