Table 4.
Characteristics of the eggshells depending on the specific concentration of citric acid applied on the shell.
| Characteristic | Time (days) | Group |
SEM | Factors |
|||||
|---|---|---|---|---|---|---|---|---|---|
| CA0 | CA10 | CA15 | Total | CA | T | CA × T | |||
| SS (N) | 0 | 58.54 | 58.54a | 2.516 | - | 1 | 1 | ||
| 7 | 53.65x | 61.82y | 61.10y | 58.86a,b | 1.116 | ||||
| 14 | 60.35 | 61.88 | 62.03 | 61.42b | 0.469 | ||||
| 21 | 61.18 | 62.37 | 61.27 | 61.61b | 0.438 | ||||
| 28 | 59.55 | 56.63 | 58.33 | 58.17a | 1.520 | ||||
| SW (g) | 0 | 8.193 | 8.193b | 0.152 | - | - | - | ||
| 7 | 7.750 | 7.987 | 7.913 | 7.883a,b | 0.078 | ||||
| 14 | 7.611 | 7.817 | 7.793 | 7.740a | 0.113 | ||||
| 21 | 7.898 | 7.938 | 7.947 | 7.928a,b | 0.083 | ||||
| 28 | 7.805 | 7.830 | 7.693 | 7.776a,b | 0.070 | ||||
| SP (%) | 0 | 13.48 | 13.48b | 0.186 | - | 1 | - | ||
| 7 | 12.83 | 13.04 | 13.11 | 12.99a,b | 0.117 | ||||
| 14 | 12.69 | 13.03 | 12.90 | 12.87a | 0.169 | ||||
| 21 | 13.29 | 13.17 | 13.40 | 13.29a,b | 0.093 | ||||
| 28 | 13.30 | 13.20 | 13.20 | 13.23a,b | 0.086 | ||||
| ST (mm) | 0 | 0.332 | 0.332b,c | 0.008 | 1 | 1 | 1 | ||
| 7 | 0.329x | 0.336x,y | 0.343y | 0.336b,c | 0.005 | ||||
| 14 | 0.324x | 0.361y | 0.357y | 0.347c | 0.004 | ||||
| 21 | 0.282x | 0.303x,y | 0.322y | 0.302a | 0.005 | ||||
| 28 | 0.323y | 0.326y | 0.299x | 0.316a,b | 0.003 | ||||
| SD (g/cm3) | 0 | 3.41 | 3.41b | 0.097 | 1 | 1 | 1 | ||
| 7 | 3.46y | 3.24x | 3.19x | 3.30a,b | 0.031 | ||||
| 14 | 3.20 | 2.99 | 3.01 | 3.07a | 0.048 | ||||
| 21 | 4.14y | 3.69x,y | 3.47x | 3.78c | 0.086 | ||||
| 28 | 3.40x | 3.35x | 3.63y | 3.46b,c | 0.035 | ||||
x,ymeans within the row differ significantly at P ≤ 0.05; a,b means within the column differ significantly at P ≤ 0.05.
Abbreviations: CA, citric acid; SD, shell density; SP, shell proportion in egg weight; SS, shell strength; ST, shell thickness; SW, shell weight; T, time.
1
The influence of factor significant at P ≤ 0.05.