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Physiological changes associated with the production of defective egg-shells by hens receiving sodium chloride in the drinking water

Published online by Cambridge University Press:  09 March 2007

D. Balnave ,
I. Yoselewitz  and
R. J. Dixon
D. Balnave
Affiliation:
Department of Animal Husbandry, University of Sydney, Werombi Road, Camden, NSW 2570, Australia
I. Yoselewitz
Affiliation:
Department of Animal Husbandry, University of Sydney, Werombi Road, Camden, NSW 2570, Australia
R. J. Dixon
Affiliation:
Department of Veterinary Clinical Studies, University of Sydney, Werombi Road, Camden, NSW 2570, Australia
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Abstract

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1. Supplementing the drinking water of laying hens with 600 or 2000 mg sodium chloride/l induced large increases in egg-shell defects without corresponding changes in egg production, egg weight or food and water intakes. A supplement of 2000 mg NaCl/l resulted in a high incidence of shell-less eggs.

2. The increased incidence of egg-shell damage in hens receiving the NaCl was associated with a decrease in egg-shell quality measured objectively. These responses persisted even after the NaCl was removed from the drinking water.

3. The NaCl treatment had little effect on blood acid-base balance and electrolytes, but significant reductions were observed in the carbon dioxide tension, and bicarbonate and calcium concentrations in the fluid surrounding the egg in the shell gland.

4. The poor shell quality appeared to be associated with a reduced supply of bicarbonate, rather than with an effect on Ca, in the lumen of the shell gland, although a reduced residence time of eggs in the shell gland may also have contributed to the problem.

Type
Mineral Metabolism
Information
British Journal of Nutrition , Volume 61 , Issue 1 , January 1989 , pp. 35 - 43
Copyright
Copyright © The Nutrition Society 1989

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