We have used precon before on both our show steers and heifers from the time we get them to HBC Show in December and then we have taken then off of it (around anywhere from 700 to 850 lb calves). This year we were thinking of continuing on and never taking them off of it? Does anyone else do this - never take them off of it? What are adv/disadv of doing this you have seen? Thank you.