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This is true for the original genetic breeder flocks, however the grower flocks produced by the company are different. The order goes:
1. Genetic breeders select and breed the absolute best birds they can (usually by natural methods of insemination, bot occasionally AI).
2. Meat companies buy these birds and raise them as their own breeder flock.
3. The eggs produced by these are then hatched and grown out for food.
Once the company buys from the genetic breeder, the birds are usually placed in a large house where they have free roam. These birds are fed either every other day, in limited quantities, or with filler (such as sand) in the feed. That way they do not grow as large, and are able to procreate as usual. The company hatches these eggs in large hatcheries, and ships the chicks off to growing houses where they...well...grow. These birds are usually killed long before they even have the ability to lay.
It would actually cost MORE to perform AI with chickens, as you would have to do millions of them. It's much easier to let the birds do it themselves. AI can be used for turkeys because they are larger, and thus you don't need to produce large quantities of them to make a profit.
Broilers are right on the edge now, and this is a subject of debate. If we breed chickens any larger, they will be unable to reproduce on their own (commercial turkeys are already this way). We have the ability to breed them larger, but are unsure if AI would be in any way plausible with the number of birds currently being produced each year.