Does anyone know what would cause a grown chicken to stand up straight to the point that it cannot walk correctly? It appears as if his hip bones are protruding forward. This is a young breda rooster that is full grown but hasn't started crowing yet. The backstory is that the bird was given to me by someone that purchased it from what was described as a chicken mill (really bad conditions). She gave me five birds total and all were very thin but the others do not have the walking problem.