This is my 2nd year hatching out Black Copper Marans. I am very disappointed this year because out of about 40 chicks, 4 have been Wheaten.
I am going to see if I can figure out which of my chickens is carrying the Wheaten gene.
My question, is: What should I do with the wheatens that hatch out this season? Sell them as brown egg layers? Tell people they are Wheaten Marans but not pure?
Snaffle... as Donna suggested, your male is definitely split for Wheaten. And at least one or more of the hens are split as well. There needs to be both genes from both parents present for eWH expression in the young. The hens will have to be test mated for Wheaten to know which are the split hens.
Okay... the odds for splits are 1 in 4 are Wheaten (or split for Wheaten). That means, in your 40 existing chicks, should be about 10 chicks actually are split, but not showing the obvious signs (like their parents.) and look pure, which is misleading and gets everyone into trouble. However, 30 chicks should be pure Golden Birchen based (BCMs.) and would need to be test mated to make sure they do not carry tainted genes.
Here's one idea for what you can do:
Sell the obviously split chicks, or any mossy chicks as you suggested as brown egg layers (pets) but not as pure, so people know exactly what they are purchasing. Some people only want pets who lay dark eggs, no breeding. Otherwise, the same thing will happen to an innocent party that happened to you, and it's just better to be totally upfront.
With the remaining pure looking chicks, grow them out, then, test mate each one with a Wheaten based bird. (Clean out the hen for at least 3 weeks.)
I suggest the Wheaten based birds be lighter, perhaps like a RIR, so you can see yellow shanks on chicks (but not a black bird). Each tested bird needs 20 test mate chicks each to be sure.
Anything that hatches other than black chicks with white bellies with yellow shanks should signal that bird is a Wheaten carrier. Even if the chick expresses copper on the head only it is tainted in some way. Still means there is something wrong and should be removed from the breeding program.
Ideally, you may want to consider getting many more feet on the ground so you can hopefully replace your roo with a pure based son. You should have at least 15 cockerels to get a fair choice of males.
If you decide to scrap your current flock and purchase other stock, just be aware that you may
still be in the same position of needing to test your flock, as far too many flock owners have not, or, do not test their flocks. Anyone who does not test their flocks should be avoided unless you are not breeding BCM or you will run into this problem again and again. We purchased an additional 6 lines to combine with our main flock, and 5 out of the 6 purchased lines expressed Wheaten! One "top" line threw yellow shanked chicks.
We now test every chicken that sets foot here- even if a seller tells us for sure their stock is clean... mistakes can happen... and I think we found every one of them last year, lol. Just saying... you might be able to clean up your flock completely in just a few short months with some effort. It is worth knowing for sure that your flock is clear of Wheaten.
Good luck!!!