This is really interesting! I had guineas a few years ago. I raised them separately from my chickens but once they were old enough they were let out to free range with them. I had no problems with them trying to breed my chickens. I did have more females then males but not by much. During breeding season they would break off into pairs or trios and keep to themselves throughout the day. At night they would all come back to roost together on top of the house or my back deck railing. They absolutely refused to sleep in their coop and I kinda got tired of catching them all, one at a time every night to make them, so I just let them be. I never lost a guinea during the night even though the chickens that decided to roost with them started getting picked off by owls, every night it seemed. I lost most of my guinea hens to predators while they were sitting on nests outside of our perimeter fence, and protection of our LGDs. I finally gave up trying to keep guineas except for one male that had a leg injury when I got him, that has caused him to limp. He's still here because no one can catch him . I do feel bad and think he needs a friend or two, but I'm worried I'll have the same problem.
So was the difference mine had not been raised with my chickens so they hadn't imprinted?
Also, does anyone else have guineas that go off by in pairs or trios and stay that way for the entire breeding season? My males would even stay watch over his ladies while they sat during the day, but would come home to roost at night. Is that not normal?
One more thing. How do you train your guineas to return to their coop to sleep and nest? Can you? Once mine left the brooder they went to the coop for about a week before they were let out. Was that not long enough? For months I went and caught them and put them in the coop at night hoping they would catch on and go on their own. No such luck.