3 chicks hatched last weekend (from 22 eggs set originally). 2 are brown - very cute, but I'm puzzling over the genetics of that, the EB of the hens should have over-ridden any brown or birchen chick down colors. The remaining black chick looks like a pullet (no headspot) and I will confirm in a few days when her primaries start growing in (hope they are all black, no barring). The 13th is a large hatch, I set 60 BSL eggs and so far 17 are still viable. That's only 28% fertility, but enough chicks to get a good feel for how they are sexing out.
The hatch I'm hoping to get your chicks from has 103 BSL eggs. If I don't get at least 1 really nice pullet chick for you from all those, I will be very disappointed.
Anyone know offhand how long it takes after introducing a new roo before the eggs could be "his"? I think it's only a few days, but I intend to set only the newest eggs on Friday on the hope that he has had enough time to increase the fertility of the flock. I'm thinking I will collect eggs from day 4 and onward, hopefully that will be about 75 eggs to set and see if he has had as big an impact of fertility as I hope.
Brown sexlinks? That sounds strange. Are you sure their father is not the next door neighbor (legbars, welsummers, etc.)?