On 27/01/2014 20:12, Janet wrote:
In article , david@abacus-
nurseries.co.uk says...

If you keep chickens then recycle the shells. dry them in the oven so
there is no taste of egg then just crush them and use as poultry grit.

I would advise against that, eating their own shells can lead to
shell-pecking in the nest box.

Better to give them oyster grit.

Janet


Which is why I said "dry them in the oven so there is no taste of egg"