I have a 5 month old bottle lamb that was down sick this past week very lethargic and dehydrated. Was at vets put on IV fluids and was given selenium and vitamin e supplement, iron supplement, vitamin b complex everyday for past week, and probios everyday. back to be perky and himself eating hay and grass but still has little to no interest in grain . will come running to the feed bucket then he will sniff it and walk away to go eat grass. Anything you guys can think of to help me out??