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Mottled or glassy shells


When parts of the egg shell are translucent, it appears mottled or glassy. Such shells can also be thin and fragile.

The egg in the photograph has been placed over a bright light . This is the way it would look to a candling operator.


The incidence is variable. Such eggs are not usually downgraded unless the condition is very obvious or the shells are thin.

Cause Control
Failure of the egg shell to dry out quickly
after laying, which is made worse by:
High humidity in the layer shed The shed must be well ventilated.
Crowding Avoid overstocking.
Disease Make sure that layer stock come from parent stock vaccinated
against infectious bursal disease.
© The State of Queensland, Australia (through its Department of Primary Industries and Fisheries) and DSM Nutritional Products Ltd., 2007. No part of this publication may be reproduced, copied or transmitted save with prior written permission of Director, Intellectual Property Commercialisation Unit, Department of Primary Industries and Fisheries, GPO Box 46 Brisbane, Queensland, Australia 4001, and DSM Nutritional Products Ltd.
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