Q&A: Drinking from troughs

E324A607-CC9F-4BA6-B946-58D074DC6B8C.jpg
(Image credit: credits-unknown)

Q: I own an 11-year-old Welsh Cob who won’t drink from the water trough in his field but he used to drink from the trough at my last yard. In summer, I bring him in at night to keep his weight down, and the first thing he does is take a long drink from his automatic water bowl.

I have tried cleaning out thetrough and offering a plastic bucket with clean water, without success. He shares the field with three cows and two other geldings, who do use the trough. What can I do?