Your orange tub looks like my black tub, likely the similarity ends with a mold.
I've had to use tubs this year to get them to eat the less than stellar hay I have an abundance of. Without any fall rain, pasture was quickly running out and they didn't like the hay until I put the tubs out. So for me, hay consumption was increased. But with that said, wasn't much pasture left so hay consumption would likely have increased anyway so we are down to condition. I wouldn't say hey are in their best condition. I would say condition loss has slowed. We did get some good rain at the end of December and early January. Winter grasses and clover are waiting for some more rain and warmer temperatures (which we are getting). Rain not so much as warmer temperatures. Turned into my last pasture several days ago and they have pretty much ignored the hay. However, still making the round to the tubs. A good rain that greybeard says are promised next week should end the hay feeding (and tubs) for this winter....I hope.