Yeah, they are too young - ~1-1/2 weeks old. I have a Cream Legbar pullet (technically she'll be a hen in a couple weeks) with ocular Mareks, so unfortunately, I know what that is supposed to look like (though for now she's alive and ok and laying). One of her "sisters" died of Mareks. The remaining third one is ok so far, and I'm using her as the mother of future pure CLs, since she's been the strongest. I'm watching all the babies like a hawk - though I bet they were all born with decent natural immunity (at least for a while) because I understand that while Mareks is not transmitted in the egg, maternal antibodies are. So we'll see how the intersection of all that goes - I'm hatching out more of my CLs than I normally would because of the need to ensure that the most healthy and resistant ones are keepers/breeders.
- Ant Farm