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Hatchery chickens have been bred for egg production. They have sacrificed some of the standards of the breed to get more eggs. A breeders RIR and a hatchery RIR are hardly the same thing in quality of meeting the breed standard.
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I have some BBS orps that began to lay at 19 weeks. one that laid an eggs at 16 weeks. My Bonnie was nearly 27 weeks before she laid.
I have had a small flock of polish that did not lay until over 30+ weeks.
I have had jersey giants not lay until 32+ plus weeks.
The production average of 18 - 20 weeks is just that - the average for chickens bred for production but is also an average egg when egg laying becomes possible in a pullet.
Think about teen girls and their cycle. Some start at 10 or 11 and some don't until 15 or 16.
Just like with other females they do vary according to individual as well.