Rural Gardening: Mis-shaped, thin shelled egg problem, 1 by Cottage_Rose

Cottage_Rose wrote:
I have a goose whose eggs never have that shiny smooth coating that eggs have. Her eggs tend to have a chalky feeling surface.
Lately shes been laying mis-shaped eggs.
Not grossly mis-shaped but just not perfect and the shells are quite porous.
She is very well fed.
She gets layer pellets, whole oats, sunflower seeds and grass now to graze on. They have access to free choice oyster shell and grit.
Anybody know why this happens and how to remedy it?