I think plenty of people will have made some sort of vitamin and energy supplement for their sheep, the real question is: was it any good? My neighbour, the one who is no longer allowed to keep sheep, used to buy raw molasses for his sheep. I don't know if he added anything to it. I have a feeling that the carefully researched and produced 'licky buckets' available at every agri supplier will work out cheaper and better for the animals in the long run than messing about with DIY