I raised those birds for many years. The older they get, the more they only think about food. It is important to keep the food and water apart from each other so that the birds have to walk back and forth. If they can reach the food and water easily, they won't even try to walk after a while. Meat birds are very different from egg layers. I always used turkey feed for my meat birds. It's a higher protein. Also, don't keep food in front of them 24/7. It's not necessary and it could kill them. If you are raising them in hot weather, put a fan on them. Give them plenty of water, but only enough food for 8 hours of the day. You don't want them to grow too fast. We had a contest at our fair every year for growing the biggest and healthiest meat birds. My family always won! 8 weeks is enough time to grow them. If done right, you can reach weights of over 9 lbs. each for cockerels. Keep them clean. The poop will get overwhelming, but you don't want them laying in it. It can cause breast blisters. Good luck. They taste amazing and are almost like little turkeys when they are ready!