when i put a double barred GFF roo over some of my lightest buff hens all of the chicks had some barring
even though the mothers had zero
Which is how it should be.
Sex linked barring (Cuckoo Barring), is carried on the male chromosome. If the Rooster is "Double Barred", meaning he has 2 copies of the barring gene one on each chromosome, then all offspring will have a copy of the barring gene from him and should show at least some barring. The barring is usually easily noticed at a young age. If bred to a barred hen, all male offspring will have 2 copies of the barring gene(Double Barred).
The barring gene has a "dosage" effect, meaning that 2 copies will have a stronger barring than 1. Hens, only having the capability of carrying 1 barring gene sometimes can look a bit "muttled" in the lighter colors such as buff and lighter colored lavenders.
Buff birds carry a few "Inhibitors", some "modifiers" and some "restrictors" . Such as Co, Ig, Mo, Cha, Choc,Rw...etc
Some of the barred birds mixed with the non barred birds to make a Cuckoo of a new color may or may not have some of these genes.
There are many paths you can follow to get to LCO, and depending on the path taken to get the original birds and finally to the LCO it is possible that some other genes, most likely some recessive or Incompletely Dominant, did not get culled out and occasionally pop up.
In the making of new varieties the breeder must be knowledgeable and diligent in his practices. "Test breeding's" should be done to check for unwanted genes and birds culled that carry them. With recessives and incomplete dominants, especially in birds with a heavy count of restrictors, modfiers or inhibitors, this can take many many breedings and generations. It is these diligent practices that create birds that reproduce predictably good offspring. (There is a word for that, I keep forgetting it!) A project is not "done" until you have parent stock that make babies that look like them!
My opinion of GFF is that they carry good "finished" stock, I don't know where they get them from, but all the birds I have seen from them are generally good birds. And for the prices they charge, they should be! LOL
Not all the LCO's out there being sold are the quality of GFF, I have seen "LCO's" that were only 2 generations removed from a Barred Rock Rooster( And they were really good looking BIrds!!)....The Rooster did not look like he was even pure Barred Rock...so who knows what will pop up int those "LCO's" !!
Clear as Mud?? LOL