Shell Structure and Composition of Poultry Eggs

TANG Xuhua; LIN Jun; YANG Haiming; YANG Zhi; WANG Zhiyue

doi:10.19303/j.issn.1008-0384.2022.002.004

Volume 37 Issue 2

Feb. 2022

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Article Navigation > Fujian Journal of Agricultural Sciences > 2022 > 37(2): 156-163

TANG X H, LIN J, YANG H M, et al. Shell Structure and Composition of Poultry Eggs [J]. Fujian Journal of Agricultural Sciences，2022，37（2）：156−163 doi: 10.19303/j.issn.1008-0384.2022.002.004

Citation:

TANG X H, LIN J, YANG H M, et al. Shell Structure and Composition of Poultry Eggs [J]. Fujian Journal of Agricultural Sciences，2022，37（2）：156−163 doi: 10.19303/j.issn.1008-0384.2022.002.004

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Shell Structure and Composition of Poultry Eggs

doi: 10.19303/j.issn.1008-0384.2022.002.004

TANG Xuhua^1
,,
LIN Jun¹,
YANG Haiming¹,
YANG Zhi²,
WANG Zhiyue^{1, 2
,
,}

1.
College of Animal Science and Technology, Yangzhou University, Yangzhou, Jiangsu　225009, China
2.
Institutes of Agricultural Science and Technology, Yangzhou University, Yangzhou, Jiangsu　225009, China

Received Date: 2021-08-25
Rev Recd Date: 2021-10-28

Available Online: 2022-03-21

Publish Date: 2022-02-25

Abstract

Abstract

Objective Shell structure and composition of eggs laid by different kinds of poultry were compared. Method Thirty eggs of Jiangnan white geese, Rugao yellow chickens, and Jinding ducks were examined for microstructures of the inner/outer surfaces and cross-sections of fragments from various parts under a scanning electron microscope, determined on the physical properties using a strength tester, measured for the thickness with a spiral micrometer, and analyzed on the chemical composition by standard methods. Result The egg weight, shell weight, and shell thickness of different species of poultry differed significantly (P＜0.05) with a ranking of goose eggs＞duck eggs＞chicken eggs. The shell strength, shape index, and weight ratio of the goose eggs were significantly higher than those of the chicken or duck eggs (P＜0.05). Both thickness and proportion of palisade layer of goose eggshell were significantly greater than those of chicken or duck eggshell (P＜0.05). The transverse section density and integrality of goose eggshells were better and the mastoid layer more closely related to the shell layer, while the shell strength highly correlated with the effective layer thickness showing a correlation coefficient of 0.603. The relative contents of carbon, oxygen, calcium, and zinc in the eggshells did not differ significantly (P＞0.05), and oxygen, calcium, and carbon were the greatest amount of inorganic substance and present mainly in the form of calcium carbonate. Thus, the eggshell quality did not depend on the relative content of these elements. Conclusion Goose eggs are significantly different from chicken eggs and duck eggs in terms of shell strength, shell thickness and shell structure. The eggshell strength does not depend on the relative content of the elements, but is more affected by the ultrastructure of the eggshell, and the density of the eggshell directly affects the eggshell strength.
- eggshell quality,
- shell strength,
- ultrastructure,
- element composition

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References(23)

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