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The integrated thermometer matches up with my secondary thermometer to within 1/10 of a degree - keeping the eggs at 99.6 For this last batch of eggs, I mixed them all up to try to eliminate any cold/hot spots in the incubator as a cause; didn't seem to matter - previous batches had approx...

Here's a site that shows the changes in the blastoderm over the first 2 or 3 days.... http://www.the-chicken-chick.com/2013/01/facts-and-myths-about-fertile-eggs.html

I think you've hit the nail on the head. The non-white breeds are orpingtons, astrolorps, wyandottes, barred rocks and welsummers - all heavier than the leghorns. I watched them closely for 2 hours yesterday, and while I did see him get up on the backs of a few of the white ones, they wanted...

I crack them into a dish to view before discarding. I don't see proper blastoderms in any of them - just the blastodisc - same as I see in the fresh white eggs. Fairly certain that they are not fertile.

Proving fertility via visual inspection during incubation. At day 12 none of the white eggs show any growth - no blood vessels or anything.

That's what I was thinking..... I do have another rooster, but he is not old enough yet....

I have a flock of 25 pullets and one rooster all the same age (11 months), raised together. All of the hens are good layers. The roo is a white leghorn; I have 7 white leghorn hens and the others are all different brown/buff breeds. Do you have any idea why the roo will not mount the white...