why arnt my ross lohanns laying,

I would try cutting out all treats then and hopefully they will start laying again soon.   

If you have not wormed them it would be a good idea as they can pick them up easily from eating slugs, snails and garden worms.  Best to use flubenvet either in powder form (to add to your layers mash) or you can buy pellets with it already added.   

Locally to me a lot of flocks have not been laying. This sometimes happens and may be to do with the very warm weather we have had. Good advice to cut out all feed except for layers - fat hens don't lay!!

All my girls have been very intermittent this week so it could be down to the weather.