Both BTB and Wheaten have pale shanks. I have had wheaten almost as long as I have had BCMs. Got them the same year in fact. I've had blues and bl coppers the longest. I have a few poorly colored BTB that came from the bayhorsebonnie line of BCM which were supposedly a good line probably in 2008/2009 before she sold them all. I also have a barred BTB from a different breeder.Just a little food for thought. Where did the BTbuff come from all at once. Look at the shanks on these Marans males on my monitor they are white . Any one that has hatched some Wheaten and grew them out can tell you these have wheaten influence. I would want to believe the person that has been involved with wheaten rather than someone that has most likely ever seen one in person. Too many opinions on here that are just not true.The best policy is ask the people that have worked with any particular color that you are interested in working with in the future. Lot of posters just throw out what they have heard to be true and have no idea if it really works.
*edited to say: BTB have a black in the wing when you spread it out. See btb wing herehttp://frenchmaransclubaustralia.yolasite.com/notes-on-breeding.php
Vs.
Wheaten will have the cinnamon wing triangle as everyone knows.
http://maranschickenclubusa.com/BlacktailBuff.html to see shank toe criteria for btb.
*Really no one can say what is in a chicken by someone just throwing up a photo. You can give them a few things to go on but that's it. Unless you get them tested genetically you don't REALLY know what's in the mix and how it will express itself. Sure you can test mate to get an idea.
For example: I have an Olive Egger cross (BCM x Ameraucana) who could pass for a very good BCM female. She even lays a #6 egg and has a straight comb etc. If I put her pic up and her egg everyone would say yeah that's a PURE BCM. Sooo good thing I can tell the difference and keep her in the laying pen.
Many people do not know the difference especially with the BCM vs Wheaten males so early on (and even still on ebay lol) you see questionable crosses being advertised as this or that pure Marans.
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