This is asserted in a book published in 1873:
"Hens of the better laying breeds, properly managed, should lay about 150 eggs per annum. Individuals will do much more than this, and have been known to exceed even 300."
Lewis Wright, The Illustrated book of poultry, London 1873. Online freely here
https://catalog.hathitrust.org/Record/012288930
This was regarded as the best of the poultry manuals produced in Victorian times, and he was the editor of a fanciers' journal.
"Hens of the better laying breeds, properly managed, should lay about 150 eggs per annum. Individuals will do much more than this, and have been known to exceed even 300."
Lewis Wright, The Illustrated book of poultry, London 1873. Online freely here
https://catalog.hathitrust.org/Record/012288930
This was regarded as the best of the poultry manuals produced in Victorian times, and he was the editor of a fanciers' journal.
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