Yeah.. except those new birds are getting the flu too..Tyson's announced weeks ago that had no effect; they had already replaced birds wiped out by the epidemic. Chickens, like rabbits, have pretty high population explosions. The 'Big Giant Epidemic' lasted about 5 to 6 months.
On average, a pullet will begin to lay an egg around 5-6 months of age. You may get lucky and start receiving eggs as early as 16-18 weeks, or have to wait a long 28-32 weeks before you receive your first egg. However, most pullets will begin to lay their first egg between 20-24 weeks.
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How Long Does It Take A Hen To Lay An Egg? | Meyer Hatchery Blog
At what age does a hen begin to lay eggs? How often each day can a chicken lay an egg? Learn about how what age and how often a chicken lays.blog.meyerhatchery.com

Birds who get the flu...are whacked and tossed.