Slobers can be caused by White Clover
Have you ever wondered why your horse comes in from your pasture slobbering and slightly paralyzed in the mouth? Alarming as it is, luckily it is only temporary and can wear off quickly.
White Clover contains an endophyte fungus that produces an alkaloid called slaframine, which causes this slobbering. It is seen commonly in the North East region of the US. You simply need to keep your horses off the pasture for a few days until the fungus subsides.