Hello all, I'm having trouble understanding why my birds are not gaining weight. They are Langshans (largefowl) and are in steel cages with a steel flooring. I think this may be the issue, if that's the case, there's nothing I can do at this point. They are fed a 1/2 mixture of 28% protein gamebird feed for quail/pheasants and a 1/2 mixture of 16% layer pellets. I then put about 20 BOSS seeds on the top. I'm debating adding some whole oats. Any ideas?