- Volume 16 Issue 2
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The Role of Magnesium and Calcium in Eggshell Formation in Tsaiya Ducks and Leghorn Hens
- Shen, T.F. (Department of Animal Science, National Taiwan University) ;
- Chen, W.L. (Department of Animal Science, National Taiwan University)
- Published : 2003.02.01
Tsaiya ducks and Leghorn hens are the two major laying birds raised in Taiwan. They are all excellent egg layers. Tsaiya ducks are small in body size (1.3 kg) with bigger egg weight (65 g) and stronger eggshell breaking strength than eggs from hens. The eggshell consists mainly of calcium carbonate, hence calcium plays an important role in the eggshell formation. Magnesium is also present in eggshell in small amounts, which may have effect on maintaining eggshell quality. In comparison studies, it was shown that the duck eggshells contained higher calcium and lower magnesium content than chicken eggshells. The eggshell magnesium content was not affected by the dietary magnesium levels (690-2380 ppm) in ducks, but in hens, it increased linearly with dietary magnesium levels. The palisade layer (
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