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Discussion in 'What Breed Or Gender is This?' started by lanaschix, Oct 2, 2015.
they are either both pullets or both roos because they look on almost identical. 5-6 weeks old
Are they mixed breed EE's? generally EE's would have muffs and beard, and not feathered legs. They're cool looking little dudes though! It's sometimes harder to tell at this age, but I would guess that they are both little cockerels, especially the one in the foreground--it appears like he has some pointed hackle feathers.
They are mixed. Dad is a RIR
Ok, just emailed the lady who gave them to me. She said they are Brahma/RIR mix. She also said they are hard to sex and to hold off longer
Actually if the dad is RIR and mom Light Brahma. that is a sex linked mating. Cockerels would come out black/white and pullets black/red/brown. So those are most definitely cockerels.
It still applies if the mother is a mix... she has to be black/white in color because there is no way you can get black/white daughters out of a RIR.
Kev - I'm a newbie. Is there a link that explains color genetics? I'm assuming from what you said that the color is dictated by the X chromosome?
This is a good thread with basic sex linked information. All the really good stuff is in the first post, don't be put off by the size of the thread.
There are some good threads in that same section, FAQ, that deal with color genetics.
Yeah that's close. In chickens it's the reverse- hens are XY and roosters XX to use the human analogy. In genetic terms, ZZ and ZW are used for birds.
The gene that makes chickens white/black is called Silver. It prevents the bird from making the red/gold pigments. For example, the only difference between buff and light brahma is the latter has the Silver gene.. causing them to be black/white instead.
Silver is a sex linked AND dominant gene. So the RIR being a gold ZZ bred with a light(that's the silver) brahma being a Silver ZW causes b/w cockerels because they got the dominant sex linked silver from their mother.. while the daughters can only get their Z from their father, which is gold, causing them to be gold, lacking silver.
Barring is another perhaps more well known example of dominant sex linked gene in chickens. It's widely used for production purposes... all Black Sex Links are produced and sexed using the Barring gene via usually RIR roosters over Barred rock hens.. the cockerels are born with white head spot and the pullets don't have this.. easy for immediate sexing at hatch.
Some lines do make use of more than one sex linked gene- for example creating a female breeder line pure for barring and silver for even more obvious sexual difference at hatch.