Hi! My two female geese have gone a bit broody, my Roman more so than my Buff. One will remain on the nest in the morning and the other will defend her. By defend I mean she'll snip at me a bit, but I'm not so easily deterred.
I hand raised them and have kept a rather hands on personable relationship with them. This helps with medical examinations and I reinforce good behavior with treats like cucumbers or meal worms.
The last two days have been a bit difficult, and this morning I noticed a bit of down incorporated into the nest so I know she's getting broody. She's fluffing up her nest and getting it properly insulated.
I've told her several times it takes two to tango, I don't have any ganders or male anything in my flock, but she doesn't care.
So what I've started doing, and it probably isn't the best option for a lot of folks due to the aggressive nature of broody geese, is to politely but firmly discourage broody behavior. I do this by letting them out in the morning, trying to escort them out, I'd that doesn't work I *physically* lift each of them out of the nest area that's in their coop.
I know this is a HUGE violation to their personal space and a threat to their home, but their ongoing broodiness is also a threat to me and my flock. As soon as I slightly lift them (I wear a thick coat, my mask, insulated gloves) they tuck their little legs and sorta don't put up a fight. Again, I did a lot of hand reading, plus their relatively small breeds who have friendly personalities most of the time.
After I get both geese out of their coop area, I bar them from re-entering. Sounds cruel I know, but I know they both lay eggs about every other day, every two days and usually overnight/early morning so I'm not concerned they'll pop an egg out randomly. There was an occurrence where I found a goose egg in one of my duck nests, but that was probably because I was letting them out too early before.
After letting the ladies out and closing the gate so they cannot reenter, I encourage them to go outside with food, water, a little pool to bathe, and if they seem really intent on going back in, I'll scatter some meal worms far away from their coop to preoccupy them.
Going to keep up with this for as long as they express broodiness. So far it's working like a charm. Also, checking and removing eggs daily is essential. Not sure how applicable my situation will be but I hope this helps. Good luck! (I've attached a photo of her nest, you can see she's almost made a little moat around it, gathering straw and pine shavings. She'll sit there and use her head to gather everything up around her.)