Pearlsacarolsinger
Up in the clouds
Probably not a good idea to feed wheat straw, it is the most likely variety to give them colic. My made has had colic from eating long barley straw. The best way to get the weight off, is to feed plain oat straw chaff, alongside a small ration of hay. They won't gorge on the chaff and you don't need to net the hay, so feeding can be more natural.