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 ?
In addition, the pesticide DDT, ingested with their food, caused birds to lay thin-shelled eggs that were broken or crushed during incubation.
Other threats, such as contaminants from industrial and agricultural sources, are often unseen until they cause fish die-offs, malformed frogs, or thin-shelled eggs.
These chemicals prevented normal calcium deposition during eggshell formation, and caused females to lay thin-shelled eggs that often broke before hatching.