Okay, a couple of good questions and maybe a dumb one :) about choc

[robbdebbie]

I have been reading up on this chocolate orpingtons breed. My first question is:

If you have a choc pullet with a black choc+ rooster your first mating will have no choc birds. Then your next mating will have what? Half of the daughters will be choc? But then how will you ever get a choc roo out of this pairing?

Next question is this:

There are seramas that are choc, and some have like different choc colors like this

Are these not totally choc, but if I breed a choc hen with one of these mixed choc roos will I have a better begining of choc seramas? Or should I just get going with the choc hen and the black choc+ roo?


Okay, here is the one dumb question.

If you breed a larger rooster to a smaller hen what size will the chicks be? I am not talking about the physical aspect of the actually mating being a problem, but more will the chicks not develop right in the shell or something?

Thanks

 

[Krys109uk]

choc is a sex linked recessive gene. A choc female mated to black males would have all black offspring. all of the females would be back & having only one Z chromosome would not carry choc. The male offspring would inherit one choc gene from their mother; they would be black carrying choc. If the black male carrying the choc gene is mated back to his choc mother, half of all his offspring will be chocolate coloured. If the choc offspring are mated together all of their offspring will be chocolate.

 

[Henk69]

I made a little something to visualize:
http://kippenjungle.nl/chocolatelakenvelder.html

If you start with a chocolate hen start with step 2
The percentages include getting the right pattern.

Problem with serama's is that they can have both types of chocolate.
Only when you mate a black split choc rooster to a black hen and get 25% chocolate pullets (50% of the pullets) and no choc cockerels you will be sure that you have the right kind. Not that that looks any different.
We did that cross in Holland but Jerry S. is not that interested in colorgenetics...

You could theorize with the chicken calculator.
Set both parents to all black; then set the chocolate locus as you wish and play.

 

[Sonoran Silkies]

To put it another way,
a female is either choc/- or Choc+/-
a male is either choc/choc, Choc+/choc or Choc+/Choc+

Female offspring of the hen will receive - (no gene--it's sex-linked)

Female offspring of the cock will receive one of whichever genes he carries.

Male offspring of the hen will receive whichever version of the gene she carries.

Male offspring of the cock will receive one of whichever genes he carries.

Any birds carrying Choc+ will not display as chocolate, but as black. Any birds carrying only choc will display as chocolate. Males who are Choc+/choc will not display chocolate, but will pass the gene to about half their offspring.