no babies

Hi Everyone, 8 homing pigeons, 2 chukar and 2 quail in my 4x4x8 foot tall coop. This is the first year this is happening. My homers lay eggs and sit on them in their nest boxes. after awhile the eggs just dissappear. I think it might be the chukars. What could cause this? Thanks Terry

I bought some older birds (2004-2008) a few weeks ago (12 pair). They have started to settle down pretty good and are very used to me. I was hoping to start to see a flury of eggs bu now but...nuthing. I have only seen one lonely egg in a nest that eventually cracked from the cold. Any idea how...