Ten days? Wow! I’ve had to follow a three day with another three day in the broody buster but the vast majority break within the first three days. Nice description, by the way.
I’d modify that description to say possibly pre-broody. I’ve had some broody hens that I never noticed any warnings, some that were pre-broody for a week before starting, and some that showed all the signs of a broody hen except nest sitting that never did kick over into full broody mode. Some hens go full broody mode instantly and hard, some have to sneak up on it, some get lost on the way.
My test before giving a broody hen eggs to hatch is that she has to spend two consecutive nights on the nest instead of her normal roosting spot. I’ve had hens spend one night on the nest then never go back. I’ve been really successful with the two night test. Besides, it normally takes me a couple of days to get enough eggs to start her.
A broody hen that is broken pretty quickly will probably resume laying faster than one you wait on. Before a hen even starts to lay she adds extra fat, which is what she lives off of while she is broody. That’s why a broody hen can get by eating so little while broody, she’s mostly living off of that stored fat. If you break her before she consumes much of that stored fat she doesn’t have to put that much fat back on before she starts to lay again.
Something else I’ve noticed. Sometimes, not always but sometimes, if you toss a hen going broody off her nest the first night you see her on there, she breaks just from that. Sometimes just checking under her to see if there are any eggs is enough to frighten her off the nest and break her. She wasn’t quite in full broody mode and that was enough to stop her. But once a hen hits full broody mode, tossing her off the nest does not phase her. She will go back. If you really want a hen to go broody, don’t disturb her the first night you see her on the nest. Leaving her alone can help kick her over to full broody mode.
Something else I think I’ve noticed. There are some experienced people on this thread so I’ll hijack a bit and ask a question. I think when a hen that has been laying in the nest in the coop starts hiding a nest it’s a sign that she is thinking about going broody. When I see that happening I quickly retrain her to use a regular nest so I don’t let that play out, but on several occasions those hens have gone broody a few weeks later. It’s certainly not a 100% sign but has anyone else noticed that?