That's really a wide open question, I personally would never try to make a hen go broody. Some breeds are very susceptible to broodiness and others almost never will. If you try to force nature, there's likely nothing good going to come from it. If you could get a hen to go broody, you may think that everything is going great until day 19, and then she decides to abandon the eggs, or a multitude of other scenarios. I'm the broody here, I pretty much don't allow any unauthorized hatching. LOL More of my problems are trying to keep them from going broody. I have 2 hens that are actually sisters and I have to constantly put them in the broody breaker, a couple weeks ago I posted a picture of one of them sitting on the feed barrel trying to hatch that. She's STILL at it. I would be happy to sell either one of those to someone who wants a broody. Right now I have about 4 or 5 hens out of 50 layers that want to be broody. The 2 sisters I believe to be legbar by australorp crosses. So breed does play a big role in who wants to be broody. I have some silkies and a few other bantams I let go broody, and they have done very well. Not sure why, but it seems like most all bantams have that tendency, even when I was young I can remember having bantams that we used to hatch everything from pheasants to ducks and geese, and even a few chickens now and then.
I agree
I would never force a hen go broody
And anyway this trick probably dosent work
And when you think of it,
It seems kinda cruel