My horse is on grass livery and gets fed a morning feed of chaff and pasture mix through the winter months, as well as hay. Now the spring grass has come through he is off feeds. He is a 10 yr old cob, a good doer and gets fat in the summer, but drops it all through out the winter. I am wondering if I need to give him some sort of vitiman and mineral supplement in the summer months. He has no hard feed in the spring,summer and autumn months, just a field full of grass, at the moment he seems to have energy but I noticed last year he started lacking in energy around August time. Would a supplement or balancer help this? I was looking in to equibites and wondered if this would be suitable for him?