Ability to Discriminate between Similar Colors in Sheep

Abstract

An experiment was carried out in order to clarify the color perception in sheep. Twin Corridale lambs were trained using an operant conditioning technique to press a switch under the positive stimulus color card in order to receive feed as a reward. They were tested to, discriminate between green and seven kinds of color, which were created by gradating blue and yellow into green. The luminosity of all colors was the same. The lambs succeeded in all discrimination tests but the most similar color combination.