I ordered 30 new brown layers about a month ago from mcmurray and three died the first day. Since then they have been doing great. Today I woke up and my wyandotte is sick. No pasty butt but wont stand up and just lays there. The chicks were vaccinated for mareks and cocci when I bought them. She wont eat or drink? Eyes are wide open and she chirps when I pick her up and hold her. The bedding (pine shavings)is changed every 4-5 days. Any ideas?