Thank you Candace! The paddock borders a forest so all kinds of trees. Oak, HIckory, poplars, maples, pines and more. No red maples though. I may put a muzzle on the donkey between hay feedings until the trees get bare. I will start rinsing the beet pulp. The donkey gets diarrhea occasionally but not like lately. They do get supplements, the donkey one called Sunshine from Blue Seal and Indigo gets Equi VM and Equi Cal from Uckele. Thanks for the suggestions!  
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Tucker and Indigo
NC, Nov 2018
https://ecir.groups.io/g/CaseHistory/files/Tucker%20and%20Indigo 
https://ecir.groups.io/g/CaseHistory/album?id=80036