No we dont use the blocks, we use the loose bloat mineral, but only when puttin calves on feed for the first time, or if we've had somethin penned and turnin it out on grass. It's just that when I was asking at the feed store about bloat blocks, (which usta be the only form it came in around here) they now carry only the loose. I don't know what other areas of the country carry, that's why I suggested the block if he couldn't find the loose. If there is more than the one doin it, I think I'd pull em all back in, put em on hay and some sort of supplemental feed, get em on a loose bloat mineral, it does other stuff besides prevent bloat. It also can be added to the feed ration to make sure they are gettin it. Its a full mineral supplement as well, least what we feed the heifers is, also good for stress when movin em, and yes it does need to be in em about a week in advance to anything that will cause stress. After they been on hay, feed, and mineral a week or so, turn em back out. After they are goin good we switch them to our regular mineral that's doesn't have the anti bloat additives in it.