I am having thos exact same problem. I don't know where you are located but here it is HOT like in the 95's. This is what my ag teacher told me. My steers have had full acess to feed 24/7. First clean out all feed then skip a feeding. Next feed them every morning around 6am when its still cool. Only feed what they will eat. Then feed at 11pm when it is also cool. Don't leave feed in pen so they will eat when you offer it to them. I haven't tried it yet but will starting today. Hope this helps you and me both