[b112]

I think you are all missing something, at least if discussing the US market.

Growth hormomes.

As an example, I've seen some US chickens as large as Canadian turkeys...

So free range, may not be getting growth hormones in the feed...

[jacobian]

This is not true. Growth hormones are not approved for us in chickens by the FDA. All chicken sold in the US is hormone free.

See, eg, https://ask.usda.gov/s/article/Are-hormones-used-for-livesto...: “No steroid hormones are approved for use in poultry”

It’s certainly true that today’s meat birds are MUCH bigger than heritage breeds, but that’s a result of selective breeding, not hormones.

[b112]

Hmm. I appear to stand corrected.

The size difference is stark, so I still wonder re: selective breeding.

[adrr]

Different breeds. Chickens we eat commercially are bred to to be that way. They can’t even walk without being in pain.

“ Most broilers find walking painful, as indicated by studies using analgesic and anti-inflammatory drugs. In one experiment, healthy birds took 11 seconds to negotiate an obstacle course, whereas lame birds took 34 seconds. After the birds had been treated with carprofen, there was no effect on the speed of the healthy birds, however, the lame birds now took only 18 seconds to negotiate the course, indicating that the pain of lameness is relieved by the drug.”

https://en.m.wikipedia.org/wiki/Broiler