Plymouth Rock Crossbreeding question for those who've seen it all before!

4hmomwyo

Hatching
8 Years
Apr 11, 2011
7
0
7

This shows the darkness and clearness variability of 4 of the Barred looking chicks.


This is one of the pure black chicks.


This is the lightest colored barred chick.


And the darkest colored barred chick.






One of the 2 that look like the original cross (Buff x Barred) from 2 years ago.













Two years ago my daughter did a wonderful crossbreeding of a Buff Orpington Roo over Barred Rock hens and we got wonderful layers and big, fast growing cockerels and they also turned out sex-linked.

This year we were looking to repeating the crossbreeding, however the set-up we used had a mixture of White Rock, Barred Rock, Partridge Rock and Buff Orpington hens and there were 3 different roos...a White Rock, a Partridge Rock and a Buff Orpington.

We ended up getting 12 chicks out of the hatch (there were some incubator issues that are not relevant to this thread). We got 1 White Rock chick, 1 Buff Orpington chick, 2 pure black chicks, 2 chicks that resemble our original sexlink hens (from 2 years ago). What is interesting to me is 6 of the chicks appear to be Barred Rock...that wouldn't surprise me if we had a Barred roo, but there can't be any pure Barred rocks. Also, no Partridge looking chicks to speak of. They are all 9-11 weeks old now. I'll attach pictures as soon as possible.

What I'm wondering is what genetics could have given us what look like pure Barred Rocks when there wasn't pure Barred parents?

Any insight would be appreciated!
 
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