However, the size of a hen's egg can vary depending on several factors, including the breed of the hen, her age, and her diet.
For example, larger breeds of hens, such as Rhode Island Reds and Plymouth Rocks, tend to lay larger eggs than smaller breeds, such as bantams. Older hens also tend to lay larger eggs than younger hens. And hens that are fed a diet rich in protein and calcium are more likely to lay larger eggs.
The size of a hen's egg is also influenced by the time of day she lays it. Hens typically lay their eggs in the morning, and the eggs that are laid later in the day tend to be larger than the eggs that are laid earlier in the day.
Finally, the size of a hen's egg can also be affected by the environment in which she lives. Hens that are raised in warm climates tend to lay larger eggs than hens that are raised in cold climates.