i realize most people can't relate to this, as they want their chickens to lay eggs. But i have a 4 year old D'Anver who has had a chronic problem with laying eggs. She will develop one too big to lay, then struggle and not be able to pass it. So we rush off to the emergency vet to remove it, usually by imploding it and pulling the pieces out. So our vet put her on Depo provera injections to keep her from developing eggs. That's worked well for over a year, but now isn't working so well anymore. We are moving from every six weeks to every four weeks on the shot. She had a shot just two weeks ago, but i just found 3 little eggs in her daytime pen this morning. So she is apparently laying every day now. Thank goodness they are small and she was able to pass them, as those emergency visits are not cheap. But i am worried about the shots not working. i realize it's a far shot that anyone else has this same problem, but just wondering if there are any suggestions to keep her from laying, short of keeping her in the dark all the time.