Laying hens in the cage with the hardness of the shell, the egg. Coloring egg yolk (a *) and the colour number is higher than the organic chicken eggs (P < 0.01), while organic chicken eggs with egg yolk color value index and Haugh (L * and b *) laying hens in a cage (P < 0.01), in addition to raising chickens, eggs and chicken eggs in captivity, organic style doesn't affect percentage-eggshell.
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