Swapped just over 2 weeks ago. We don't move onto the summer fields until the ground is dry enough not to trash them and I give them a few days building up the amount of grass as it's a big change from the winter fields which have nothing then. 2 Tbs unrugged, both have picked up a bit of weight since the change. I like this time when I can leave them naked, once the horseflies arrive, I will have to put fly rugs on.