Pengu, my 6 mo. old Australorps hen started laying ~6 weeks ago...she was 2nd out of my 5 chickens to start laying, and lays large brown eggs...for the first month was pretty regular and laid every one in the nest box. She started laying larger and larger eggs and has laid several big double yolkers. She had suspicious lapses in laying (I was investigating her for possible egg eating after 4 days with no eggs). Yesterday she was acting strange, squatting and fluffed up, and then after some straining popped out a shell-less egg in the middle of the lawn....then, a couple hours later she popped out a second, even less well-formed egg-blob while straining in the run (both had yolk and varying amount of white, but no shell). Immediately all the chickens try to eat the shell-less eggs, but I scoop them up . I made sure she was getting lots of water and gave her some extra TLC, but today, she did the whole routine again. She was hunkered down in the next box for an hour this morning, didn't lay anything, then popped out two more shell-less eggs over a few hours right onto the lawn in the afternoon. I've been trying to get her to eat more oyster shell in case she is calcium deficient, but she doesn't seem too interested in it (maybe the problem is she's finicky and doesn't like oyster shell? She's otherwise a huge glutton for treats and other food and seems perfectly fine and energetic other than the bouts of straining). The hens all get an oyster shell-grit combo mix free-choice beside their food and water, access to the greens and bugs in the yard and a small handful of scratch several times a week for a treat. They've gone through their food slower than I expected, so they're still finishing off a 50lb bag of start and grow chick feed that I bought when they were younger....would layer pellets help? I used to keep a red warming lamp in the coop, but took it out a week ago...could this affect her? How can I help this bird get back to regular laying? Should I be giving her anything special to compensate for producing two yolks/day? Thanks for any suggestions!