My buck and my wether, were a little bloated when i got them. Now they seem really bloated. I'm concerned I'm doing something wrong. I am giving grain plus hay. About a cup each one in morning, then in the evening. Is it too much? I don't want them to die on me. The girls get the same thing but they look fine. Also the boys tend to eat ALOT more than the girls. They finish the hay and grain. Any ideas?