The Egg Farmers of Ontario marketing board is cutting the maximum egg-laying lifetime for birds to 12 months.
Some producers have been keeping their hens in lay for 13 months.
The board is making the move through an amendment to its “home week” policy.
As hens age, a higher percentage of their eggs fail to meet Grade A standards, mainly because of an increased incidence of cracks.
In a message to its quota-holding members, the egg board says anyone who keeps a flock longer than 12 months will be “in contravention” of board regulations.