Calcium and behaviour/chronic health problems

I have the problem of too much calcium in feeds both added and also in the form of naturally occurring calcium in feeds like alfalfa and sugar beet. He's a complete donkey normally but give him unmolassed sugarbeet and he turns into the amazing exploding Tb. I have since done forage analysis of all the yards I was at and like jilla only feed straights as it was too difficult with compound feeds.
 
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