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| | CONCEPTS OF EGGSHELL QUALITY |
 | | The average eggshell contains about 0.3% phosphorous, 0.3% magnesium, and traces of sodium, potassium, zinc, manganese, iron and copper. |
 | | However, excess vitamin D and its metabolites have not been shown to benefit eggshell quality when normal hens are already consuming adequate vitamin D. Other vitamins and trace minerals, when fed in excess of the hen's requirements, have failed to improve eggshell quality. |
 | | Usually, eggshell quality is not as much of a problem in cooler environments as it is in hot environments. |
| www.afn.org /~poultry/flkman4.htm (1290 words) |
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