College of Animal Science and Technology, Zhejiang Agriculture & Forestry University, Lin'an 311300, Zhejiang, China.
Hangzhou Xiaoshan Chicken Breeding Co., Ltd., Hangzhou 311300, Zhejiang, China.
Poult Sci. 2021 Mar;100(3):100965. doi: 10.1016/j.psj.2020.12.062. Epub 2020 Dec 26.
We studied the correlations between egg geometrical parameters (i.e., egg shape index, sphericity, geometric mean diameter, surface area, and volume) and eggshell qualities, or the organic matrix in eggshell. Eggs were collected from 5 poultry breeds belonging to 3 species (commercial Hy-line Brown Chicken, Shaoxing Duck, Jinding Duck, Taihu Goose, and Zhedong White Goose). The geometrical parameters showed high variation among 3 species of poultry, and even between breeds in the same species. The five geometrical parameters were grouped into 2 sets, one contained shape index and sphericity, the other comprised geometric mean diameter, surface area, and volume. The parameters in the same set can be perfectly fitted to one another. Egg weight, shell membrane weight, and calcified shell weight were significantly correlated with geometric mean diameter, surface area, and volume. In accordance with false discovery rate-adjusted P value, both shell membrane relative weight and calcified shell thickness showed no significant correlations with any of the geometrical parameters. However, the correlations between geometrical parameters and other shell variables (calcified shell weight, shell relative weight, calcified shell thickness uniformity, and eggshell breaking strength) depend on breed. Both constitutive proportions and percentage contents of 3 eggshell matrix components (acid-insoluble, water-insoluble, and both acid and water facultative-soluble matrix) had no effects on egg shape and size. The correlations between the amounts of various shell matrix, egg shape and size depend on breed or species. This study provides a methodology and the correlation between geometrical parameters and eggshell qualities, and between geometrical parameters and organic matrix components in calcified shells.
我们研究了鸡蛋几何参数（即蛋形指数、球形度、几何平均直径、表面积和体积）与蛋壳质量或蛋壳有机基质之间的相关性。鸡蛋采集自 3 个物种（商业海兰褐鸡、绍兴鸭、金定鸭、太湖鹅和浙东白鹅）的 5 个家禽品种。3 个家禽物种之间的几何参数存在很大差异，即使在同一物种的不同品种之间也是如此。这五个几何参数分为两组，一组包含形状指数和球形度，另一组包含几何平均直径、表面积和体积。同一组中的参数可以完美拟合。蛋重、壳膜重和钙化壳重与几何平均直径、表面积和体积显著相关。根据错误发现率调整的 P 值，壳膜相对重量和钙化壳厚度与任何几何参数均无显著相关性。然而，几何参数与其他蛋壳变量（钙化壳重、壳膜相对重量、钙化壳厚度均匀性和蛋壳破裂强度）之间的相关性取决于品种。蛋壳基质的 3 种组成成分（酸不溶物、水不溶物和酸和水兼溶性基质）的固有比例和含量均对蛋形和大小没有影响。各种壳基质的含量与蛋形和大小之间的相关性取决于品种或物种。本研究提供了一种方法，以及几何参数与蛋壳质量之间的相关性，以及几何参数与钙化壳有机基质成分之间的相关性。
