It's likely not enough calcium. Something in the diet. All your other components are in place. If they are getting calcium, then something else may be chelating it/interfering with its absorption or utilization. It's very likely diet related. Protein seems fine. Look at the minerals. Maybe just get a new bag of laying ration. Sometimes the feed mill screwed up the mixture.
Thank you Eneryvet, I'll have a look at their diet. I can't remember where I bought the last bag of feed but I'll maybe try a different source from my usual haunts. They did spend yesterday afternoon kicking their fluffy heals up rempaging through the garden, I like to give them a bit extra freedome every now and then. Maybe they filled up on junk food!
Free ranging is good as long as they're safe. May get done calcium there if its available. Animals will seek out calcium when they are deficient. One if the few things are bodies know we need. Every crave cheese or milk? Oyster shell is what most people supplement with. Also crushed up egg shells, but oops you don't have those.
lol, yes a bit short on the egg shells! Would water stop them absorbing essential vitamins? They are constantly kicking mud in their water and if I'm not about to replace it they can go a few hour with just muddy water to drink. I'll have to come up with a better watering system, .
I'm not sure if there is any sulphur (sorry we spell things differently over here sometimes). The watering system is not unlike the thing you have in your avatar there TinyHouse but as I say they jusy keep kicking mud into it so goodness knows whats in it! I'd be greatful of any suggestions of tried and tested systems?
I disagree with Energyvet. My experience has always been that you get a few shell-less eggs when hens are "breaking in" their egg laying equipment. Having said that, for the best results, you need to make sure your hens are getting plenty of calories and good nutrition through foraging and a commercial laying ration. It takes a lot of energy to lay an egg.
I've got 3 chickens laying perfect eggs and one that had started laying either shell less eggs or todays had a very thin shell that fell apart as I tried to pick it up. They are all free range in an orchard area and get layers mash plus a few extras and rummage around on the compost heap.I have run out of grit and oyster shell that I give them separately but the mash is supposed to contain it anyway.could one chicken need the extra calcium for some reason? Seems odd......