Can pigs see in color?

A paper on Temple Grandin’s site, “Behavioral Principles of Livestock Handling” says that while humans can see the full color range, pigs and other farmed species are most sensitive to yellow-green and blue-purple light.

Leif Lykke presented a paper in Denmark this year that says pigs can see black, grey, white, blue, red, and brown but that they can’t detect green, yellow or orange.