Hi thanks for your message. I will double check when I go out but i think it’s a mixture of oyster shell and grit. I got it from an animal shop, they recommended for hens and ducks. Should it be both or just oyster shell? They have access to semi-free range (a large enclosure) and I assumed they’d pick up bits of grit/small stones/insects along the way too. Interestingly, I changed some of their feed recently as the usual supplier didn’t have any available. I’m wondering if that’s added towards this issue. Although I do definitely need to worm them as well. I’ve purchased Flubenvet and it’s delivery is imminent!
Thanks, @Lola1609 . I don't know what your soil is like, and many people just let their chickens get whatever grit they need from the earth. But I do provide oyster shell in one container and chicken grit in another, just to be on the safe side and guarantee they get everything they need. Roosters and non-laying chickens do not need the extra calcium that layers do, so I feed an all-flock formula that does not contain calcium. If you mix the grit and oyster shell, it seems to me your non-layers, if you have any, are likely to get more calcium than they need. I don't know if this might be contributing to this hen's problem, but grit might help her and IMO is worth a try. Good luck with her, you have excellent people advising you here!