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"Poisonous" does not mean deadly. Some manifestations of toxicity are subtle. The dose, as always, determines if a plant is safe source of nutrients or a toxic hazard.

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BRIEF: Is there an additive that I can put in feed for treating and preventing the effects of fescue?

I am trying to find an additive to put in mineral or salt or feed for treating and preventing the effects of fescue..


If you are focusing on late gestation havoc played by fescue on horse reproduction (abortion, delayed parturition, etc.), then pulling horses off the fescue pasture and hay at 300 days of gestation (or earlier, if you can) will take care of most of those kinds of problems. Also, frequent clipping/mowing of fescue pastures to prevent seed formation will reduce the amount of ergovaline and the other endophyte alkaloids eaten. For other hypoprolactin mediated effects, the domperidone is your best bet.