05-09-2013, 05:11 PM
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Alsike clover causes photosensitivity. Every single case of "sunburn" I have seen in my experience has been from alsike clover. You can find lots of information if you google it, photosensitivity is the #1 sign, and it also causes liver damage, among other problems.
It's very hard to find and get rid of, the plants are very small and difficult to see, especially once it's cut and baled in the hay. For some reason it's not very commonly known, I see all these people slathering sunscreen on their horse's faces year after year because "Oh noes Dobbin will sunburn!" and what they really need to do is check their pastures and hay and get rid of that clover, because it is toxic to horses.
Something you could look into for sure.
EDIT: I just saw that you are in Alberta as well. I would bet money that it's alsike clover!!