My understanding of grass rings are a change in diet.I was trying to find a before picture but can't at the moment, they do look so much better than that! I'm a little stumped as to why he keeps developing event lines if anyone has any ideas, he's never on lush grazing and never has a pulse or heat or anything...
Grass flush, changing fields, stopping hay/ introducing it, worming, mineral changes
etc.
Did you move about 4 months ago?