Break open a couple of eggs and look for the "bulls eye" on the yolk. If your girls have large "skirts" you may want to trim them a bit.How does one check for fertility? The only roo we have is Fredo. He hatched from an Ebay egg end of December. He does dance with both of his ladies. Both hens are very fluffy, one's the silkie and the other is the frizzle silkie/cochin cross. I put the eggs back under the black silkie, thought maybe if I give it another week something may happen? Just odd that at Day 10 there's nothing at all visible. I remember when we incubated we had veining visible before day 10. I gave her more wood chips for insulation. The other 2 birds leave her alone though, they don't pick on her at all.

This girl has a poofy "skirt" . If your girls are like this trim some of the feathers off to give clear access to her vent.