The yolk was still in tact. I located the ovum on the yolk and there wasn't a bull's eye. I know how to tell a fertile egg from an infertile egg.
There was a dark red ring that had formed around the shell. It grew each day of incubation.
Did you candle the eggs before you began incubating them? Perhaps your yolks could have burst because of bacteria.
As far as the cochins go, I trimmed their butt fluff last month. It didn't work, so I began artificially inseminating. The eggs still aren't fertile.
He mounts her all the time, but nothing I've tried has worked. At this point I'm assuming that he's infertile.
Sorry to hear about your roo.
*I didn't mean to insult you, I did not know if you opened the egg or were going based off of not seeing development when you candled.