Many cases are on record showing that a race may be modified by occasional crosses if aided by the careful selection of the individuals which present the desired character;
Kasu asko daude paperetara jasorik, agirian jartzen dutenak arraza bat noizbehinkako gurutzaketaz eraldatua gerta daitekeela, nahi diren ezaugarriak dituzten banakoak kontu handiz aukeratuz gero;