Wrinkled Eggs
These eggs appear to have ridges or wrinkled surfaces. Overcrowding, which results in stressed hens, can cause this abnormality. It also can be seen when a hen’s shell gland is defective or if the flock has infectious bronchitis. Wrinkles can result in weakened shells. Based on USDA standards for exterior eggshell quality, a wrinkled egg is downgraded to Grade B.
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my first guess was a plaster egg. you use them to keep the hen brooding, even if you took her eggs, but if that thing came out of a hen, sorry, babe
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