It was going so well now no eggs and feathers disappearing

Hi - my two hens are must be about a year now.  One is doing fine but the other I noticed has lost all her breast feathers and now see her neck feathers are going too.

They used to have the run of the garden but a few months ago i started keeping them in their run - she is now not laying although she is eating and drinking well and not obviously ill so I have allowed them back in the garden.

Her egg laying was fine then the last two she laid one had no shell then the other was tiny!

Am i missing something here - any advice?  I am currently de-licing and have always cleaned and used red mite stuff in their coup.

They are given layers pellets, sometimes a treat in the afternoon and I do also boost their vit supply with cod liver oil and marmite on toast maybe once a week.

Appreciate your advice - thanks Clare

Could she have gone into moult?  One of mine has and there are feather everywhere.

They lose feathers, their combs pale & shrink and they stop laying.
She may not lay for a couple of months.
But when she regrows her feathers she will look pretty & prestine!!

One of my girls has just gone through a moult, did get a couple of smallish eggs but last couple of days she's got back in the swing of things, probably 3 - 4 weeks in all that she wasn't laying for

I'd supply oystershell separately NOT in their food that way they will take what they need if any.  If you feed layers and not too many treats they will be getting all the calcium they need but ad lib oystershell won't do  any harm.

It does sound very much that your hen is moulting albeit rather early in the year which could indicate a diet issue.  In which case just ensure they have a sound simple diet of layers ad lib available all the time and a handful of corn each in an evening and don't overfeed with treats or kitchen scraps (ideally none).  I wouldn't supplement though a multivit in their water should help.  Supply clean fresh water daily.

I don't think there's much else needed at this stage other than letting nature take it's course.