If you turn him out (maybe day time only at first?) you will be able to see if he is eating grass
If so, then drop to 2 feeds a day.
We have had similar who have been accepted by their mums but ran up to us when we arrived in the field with a bottle ,drank it and then went back to mum
Bear in mind, if you are thinking of keeping him, that a bottle fed ram is likely to grow into a fairly powerful and dangerous animal