I purchased 12 adult quail (2roo/10hen) that were 8 weeks old at time of purchase. They were laying the first week I got them but haven't laid since. I have added light on a timer with 15 hours/day of light in the coop .they are eating Purina gamebird chow 30% .I have added oyster shell. Still nothing. No eggs in 3 weeks .don't even hear the roosters criw anymore. Any ideas?