Well as far as "MAKING " a hen go broody. It's not going to happen for most hens, not saying that every hen will follow that rule, but most will not. Now can you entice one to go? Humm not sure. I do what my grandmother did back in thd days. I'll leave 10-15 eggs in the nest, marking each one by the date they where layed (on end of air sack). Then remove the oldest one as they lay newer ones and mark them. That way they will always have the freshest eggs under her if they do go broody. This is my first time with Welsh Harlequin ducks. I had no ideal when or even if my ducks would go broody. So last month i put 4 eggs in my incubator just to besure the eggs were fertile. (You ALWAYS wont to be sure your eggs are fertile before trying this). And once i saw they were developing, i started saving back eggs. And after i got the amount of eggs needed I started rotating out the eggs until one of them went broody. Im thinking it took just over 3 weeks before that happen. And as you can see in the pic it worked!!!