Very seldom. We as a family process 100-125 for our own use, we sell quite a bit to close friends as meat birds and sell some at auctions. It's a heritage breed and most of them are between 2-4 months of age when we process them. They are nowhere as big as a broiler.
There are definitely exceptions to the rule. I had a hen brood 9 eggs last summer, she hatched 9 out of 9 and they all turned out to be pullets. However, I hatch an average of 300 eggs a year and it evens out to about 50/50.
This is my experience.
Most of the eggs that I hatch are slightly oblong round eggs, it's a breed characteristic. I get the normal 50% - 50% male to female ratio. I have noticed however, that the very early spring hatched batches versus the very late fall hatched batches seem to follow a pattern...
Check out these standard cochins. Very similar in type, I don't know this person and I don't want to violate any copy right laws so I'll just link a website. https://www.hawthornhillpoultry.com/black-cochins-1?pgid=k3abzt62-0cd09222-4032-4622-9545-3ea2fe4f83fb
With the chicken breed that I raise, most of them notice a stranger. They will normally come right up to me, but when a stranger is with me they keep 6-7 feet or more away from me. I like that they notice a stranger, I specifically selected for that trait when I noticed it. Several generations...
They are called Cochin because they look like Cochin, never mind that they might not even have any Cochin blood in them. As far as I know that goes for all breeds. If you could breed a Leghorn to look like a Cochin it could be called a cochin and none would be the wiser.
As far as intelligence in chickens, it makes a big difference whether they have been coddled for generations to keep them alive or whether they had opportunity to free range and escape from predators. Survivability can be bred for. In my mind survivability is translated as intelligent.
I've had more respiratory/eye problems in my chicks with pine shaving than with cedar. The cedar was Eastern red cedar and the pine was a soft pine. Coincidence? I don't know.:idunno
I use a mix of bedding now. Soft wood pellets, chopped hay, chopped straw, shredded paper and a cedar pine mix...
Plus, if you hatch to replenish the flock you keep better genetic diversity by keeping two roosters.
I've had chickens do that. They flap their wings really hard, climb up the fence and jump out. My fences were all six feet tall.
If you want to use ACV at 5% acidity, only use one teaspoon per gallon of water. I have used ACV with or without the "mother" periodically with my chickens and my chickens have never suffered any ill effects from it. This is coming from someone that typically hatches 200+ chicks a year and...