Are cows color blind?

Answer

Cows are mostly color blind. More specifically, cattle are red-green colorblind, so they are unable to see either of those two colors, and their ability to see other colors is limited. Red or green objects simply register as black or grey to a cow's visual perception.

Since cattle have no more than two color receptors, all they see in terms of color are certain shades of blue and yellow. The proliferation of bullfighting in different parts of the world has led to the widespread impression that cattle in general respond to the color red; however, whether the animal is a bull, a cow, a heifer or a calf, cattle cannot see the color red. In fact, when a bull sees a matador's red cape, all it sees is a shade of grey, and a charging bull is responding more to the specific movements of the matador and cape.

Q&A Related to "Are cows color blind?"
The blind spot in a cow's eye is the place in the eye where the optic nerve connects with the retina. This point is the optic disc, and there is no photoreceptor cells on the disc
http://wiki.answers.com/Q/What_is_the_blind_spot_o...
Use a blue-yellow color scheme The dominant color vision defects are protanopia and deuteranopia, accounting for 90+% of color vision defects. (The remaining TWO are rare.) Tests
http://www.quora.com/What-Web-Colour-Pallet-Is-Bes...
The NCBI web site requires JavaScript to function.
http://www.ncbi.nlm.nih.gov/pubmed/7603561
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