I have friends who have kept chickens for years and have always baked the shells to add as grit. I think it's only illegal if you're taking part in a commercial enterprise - ie selling the eggs, in which case you have to have them salmonella-tested anyway. I doubt any salmonella bacterium would survive the heat and desiccation of baking. But in the general view that cannibalism is a bad thing, I think you're better off not doing it. And 'define wobbly'? Well, I've seen an egg like this... it is egg-shaped, but instead of shell there's just a thick membrane - imagine a balloon full of water but not-quite-fully extended. Tasted fine though.
Funny that this subject should rear it's head. I boiled an egg the other night - in the fond hope of having a curried egg sandwich - and deliberately boiled it for 6 minutes. I had not eaten for around 48 hours and was quite looking forward to the feast. I left it in cool water for a couple of minutes, which is my usual ploy to avoid blistered fingers, and then grabbed it with the intent of stripping the thing naked. Now, I was half tickled at the time, but, when it simply collapsed in my hand in an approximation of the childrens' goo stuff that one sees advertised, I threw it in the general direction of the compost bin. Luckily my aim was straight (not bad from 6 feet into a 4" x 4" container). My wife was not impressed! I now have to search my locality to find someone who grows roses which I can nick. So, BTD, I look forward to your contributions on chicken (whoops, sorry, flerdle, chook) husbandry. I'd love to have a few banging around in the back yard but I suspect that, apart from local council regulations, my two cats might just have a say in that.
Dujon]:o) What rotten cluck! I'll be very happy to supply you with fresh eggs if I ever make it down-under or if someone invents a way of sending food as email attachments. Cats are an endangered species here in Warwickshire. I witnessed a Buzzard attack on our own cat a year or so ago. The local Buzzard population is booming and There are reports in local papers of missing or mauled moggies. The chickens, however are safe. I hope. I think. Boolbar] Yipee! And thank you.