I bookmarked the article <a href="http://thatpaleoguy.com/2011/10/10/neolithic-equids-why-the-long-face/">http://thatpaleoguy.com/2011/10/10/neolithic-equids-why-the-long-face/</a> by the Paleo Guy where he blogged about health problem in horses caused by eating grains, including oats.