Sex- linked Information

[Tara80]

From the first post:

ouote" The second important rule is that one should not use white birds in sex linked crosses. White birds that have the correct genotype can be used to make a sex linked cross but a breeder never knows if the white bird has the correct genotype. The authors advise concerning white birds and sex linked crossing is do not use white birds in sex linked crosses. White leghorns can not be used in any kind of color sex linked cross." end quote

silver spangled thuringians x buff orpington cockerel will work because they both carry a gene that will clear black from the down.

The birds must have true spangling and not mottling or false spangling.

Tim

 

[piggirl19]

Thank you so much

 

[nicalandia]

Update...

Semms like Cream Creasted Legbars(which are Sex linked Barred) males mated to Golden Laced Wyandottes cant NOT produce Visible(at hatch) Sexlinks, seeing how both are based on gold the only sex link gene is Barring, but the Males dont show the white/cream Headspot as they ussualy do on other crosses..


the CCL x Silver Laced Wyandotte crosses also show this unmarked(missing) white headspot, but they can be sex linked because males have pale yellow chipmunk faces and Patter and famels have gold chipmunk faces and pattern

 

[Chookbola]

From the first post:

ouote" The second important rule is that one should not use white birds in sex linked crosses. White birds that have the correct genotype can be used to make a sex linked cross but a breeder never knows if the white bird has the correct genotype. The authors advise concerning white birds and sex linked crossing is do not use white birds in sex linked crosses. White leghorns can not be used in any kind of color sex linked cross." end quote

silver spangled thuringians x buff orpington cockerel will work because they both carry a gene that will clear black from the down.

The birds must have true spangling and not mottling or false spangling.

Tim

I wasn't sure about my RIW because they are a production Single comb variety from privett hatchery. Allot of people told me they were just a white bird mix especially since the comb wasn't the same as the heritage variety.. But i wanted to try the hens out with my RIR rooster anyway and i got lucky. My RIW hens after hatching two batches of chicks did produce the sex links. Im SO glad these RIW hens have the correct genotype. It really is a toss up with hatchery white birds isn't it. Anyway im happy mine worked its the only reason i bought the RIR roo and RIW hens, I really like the Golden Sex links

 

[Chookbola]

Would a RIR roo work with any silver based hen

 

[tadkerson]

Would a RIR roo work with any silver based hen

No. The silver hen must have the correct genotype. That is why I made a list.

Tim

 

[nicalandia]

No. The silver hen must have the correct genotype. That is why a made a list.

Tim

Tim What could be preventing the headspot on e+/eb CCLxGLW on males? or on CCLxSLW males? I know both genders should have theheadspot as the CCL is a rooster but none of them show it? or at least visible

 

[tadkerson]

Tim What could be preventing the headspot on e+/eb CCLxGLW on males? or on CCLxSLW males? I know both genders should have theheadspot as the CCL is a rooster but none of them show it? or at least visible

Nothing in the research on the subject. My guess would be the pathway that produces the head pigment is not affected by the barring gene. Reds(pheomelanines) and black pigments (eumelanines) start out on one biochemical pathway but splits and reds are produced on one pathway and blacks are produced on anther pathway. The barring gene would have to only inhibit some enzyme in the black pigment pathway after the split and not affect an enzyme in the red pathway.

That is the simplest answer I can give. It could be other things but they also would just be a guess. Tyrosine levels or tyrosinase levels can effect pigment production. It could be that the pigments are not being transferred to the cells that add pigment to the growing feather in birds with head spots and in birds without head spots the pigments are transferred to the cells.

Every guess would be controlled by a gene or promoter. Or some other genetic function.

Tim

 

[nicalandia]

Quote:
Thanks Tim

 

[CibolaChooks]

So i got lucky to get some Production RIW pullets with a striaght comb that have the correct genotype and they produce Golden sex links when i cross them with my RIR roo.

I used these RIW hens with my Cream legbar rooster and i got some amber link looking pullets and all white males with red leakage. As chicks they are sex links buts its a bit tricky. They both had a tiny tiny dot on the back of the head between the top of the head and the start of the neck. I wish i could remember which is which but one sex has an all yellow topped head and white chick down body. the other sex had a white blob on the top of its head covering the majority of the top of the head with the same yellow color surrounding it. and then an all white body also. If this yellow head verses yellow head with white blob is too hard for some they are also notciibly a different color by a week or two.

Here they are. almost full grown.

She is almost as big as my RIW hens now


Here are the all white boys from this cross. They remind me of the Golden sex link boys.


She really does remind me of the amber link hens



Here she is with the male from this cross