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Flat-sided eggs


Eggs are said to be flat-sided when part of the shell is flattened or indented. Often the adjoining part of the shell is wrinkled.


Flat-sided eggs normally make up less than 1% of total production. They are most commonly produced by pullets in early lay and may be the result of double ovulation or being held over an extra day in the shell gland. Incidence can vary with the strain of bird.

Cause Control
Disease; traditionally linked with infectious bronchitis Follow an effective vaccination programme.
Stress, e.g. frights and disturbances To avoid frightening birds, minimise human activity in and around the shed. Increase shed security to stop other birds and animals entering the shed.
Crowding Avoid overstocking.
Incorrect or changes in the lighting programme There should not be sudden, large increases in day length as pullets come into lay.
© 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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