I don't have alot of experience yet. In fact I am mid first broody hatch. However, I have a mixed flock of 4 millie defluer/Cochin and an Isbar a Maran and a Swedish flower. Everyone but my Swedish flower and 1 mix went broody in time. First the Isbar and 2 of the mixes. I have a rooster so I gave them 3 eggs. A few days before they were set to hatch the Maran went broody and just sat in the coop. No eggs I knew of except when the Isbar left. The chicks hatched on Mother's day. Maran was still intent on hatching I gave her 7 eggs. Unbeknownst, to me they appearently had 2 more eggs in there. They hatched on the 12th. When they hatched one more mix went broody. Now one of the original 3 went back in the coop and is sharing eggs with maran and the newest broody... Hopefully, she's just hanging out to get the latest babies moving. Also, I had to buy store eggs :/. So it can happen. As mentioned it just depends on your breeds, enviroment and so on. I think next year I'll separate the first broodies to hopefully keep the rest from going. If you can I'd give it a go. Just don't give then expensive eggs the first time around just in case..