Anyone had a horse with a bad reaction to alfalfa?

I have recently taken my boy off Simple Systems green gold , which is an alfalfa chaff as I think it is affecting him negatively. I have moved him onto Simple Systems Timothy grass which is just a plain chaff of chopped grass

What sort of reaction did you get to the Simple Systems Green Gold?
 
I was using alfalfa for my tb and it sent him nuts! He was really forward all the time and really uncontrollable! I couldn't hack him out because he would try and bolt off
 
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