Auto door randomly closing during the day

[doctors girls]

one of my girls is laying thin shelled eggs but the other two are ok they have access to mixed grit they also FR in the garden and have been wormed twice this year and the next time they need to be wormed is january next year i do them every four months but wondering would limestone flour help as an additive to there food or would it be too much for the other two i read some where that too much calcium is bad for them and results in problems any ideas and has anybody used it if so what is the dosage many thanks

[LolaLayla]

I had a problem with my girls in the summer. Mine free range but I don't think they were getting the right stuff. I now give mine some limestone flour (probably about a tablespoon to half a grub of layers pellets), oyster shell, grit and to be sure, dried crushed egg shells. Someone may possibly say I am now going overboard but it has done the trick and there seems to be no ill effect....so far Hopefully someone with more experience will be along to give you advice too

[The Dogmother]

I use either the limestone flour or crushed, baked eggshells but I always add some cod liver oil to the pellets as well as it helps them to assimilate the calcium, making it more effective.