thin-shelled egg


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thin-shelled egg

thin egg shells can be caused by a nutritional deficiency of calcium, phosphorus, vitamin D, copper or manganese. Other causes are sulfonamides in the diet, end of the laying season, a diet contaminated by DDT and diseases at a chronic or subclinical level, e.g. infectious bronchitis. See also thin-shelled egg.
References in periodicals archive ?
Carson reported that birds ingesting DDT tended to lay thin-shelled eggs which would in turn break prematurely in the nest, resulting in marked population declines.
Symptoms include sneezing, coughing and gasping for air; nasal discharge; greenish, watery diarrhea; depression, muscular tremors, drooping wings, twisting of the head or neck; drop in egg production and thin-shelled eggs, swelling around the eyes and neck or sudden death.
In addition, the pesticide DDT, ingested with their food, caused birds to lay thin-shelled eggs that were broken or crushed during incubation.