Shell colour and egg size vary with the age of the hen. When the hen starts to lay, the shell of the egg will be brown and the eggs will be small. As the hen gets older, the eggs get larger and the shell colour fades. Yolk colour alters with the seasons. An abundance of green feed gives a golden glow to the yolk; however, in the middle of summer when the pastures are dry the yolk will be paler without affecting the quality of the egg.
Information source: Katham Springs (Kangaroo Island) biodynamic free range eggs.