I assume the question is about hens and eggs? In which case, calcium is needed in a laying ration to help the hen lay eggs with a strong shell.
The medullary bone is not a specific bone in the skeleton of a chicken, it is a type of bone. Medullary bone is unique to female avians. It is an unstable secondary bone in the marrow cavities of bones that can be used during the reproductive period. If a calcium deficient diet is fed to laying hens, the hens will deplete their own skeleton of calcium by using the reserves in the medullary bone structure.When this happens a paralysis can happen called Cage Layer Fatigue.
If your eggs are a little soft served for your liking, it's an indication that your chickens probably need some more calcium in their diet. Normal layer feed that you're giving your hens does have more calcium in it than other types of feed, as laying hens do need more than other types of chicken.
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All hens lay eggs.
There is no such thing as a "boy hen". Hens are female chickens.
on sitting on them Hens on a farm lay eggs into straw and the hens sit on the eggs until they hatch. Hens in large chicken farms do get to have such a luxury. The chickens' eggs are kept under heat until they hatch.
Soft-shelled eggs indicate a lack of calcium in the hen's diet. Feed more oyster shell or finely-crushed, dry eggshells.
Hens are mom chickens and roosters are dad chickens. Only mom chickens, hens, lay eggs. They lay eggs all year.
The medullary bone is not a specific bone in the skeleton of a chicken, it is a type of bone. Medullary bone is unique to female avians. It is an unstable secondary bone in the marrow cavities of bones that can be used during the reproductive period. If a calcium deficient diet is fed to laying hens, the hens will deplete their own skeleton of calcium by using the reserves in the medullary bone structure.When this happens a paralysis can happen called Cage Layer Fatigue.
Eggs from battery hens, i.e. hens that are kept in cages (known as batteries) where several hens live together in one cage. These hens cannot roam freely as free-range hens can.
Calcium food like e.g: milk eggs cheese consult your g.p about bone growth.