creating sex-links?

[nicalandia]

seems I can´t edit my post(new forum)..

let me make this clear.. Leghorns can´t be use in Gold(s+), Silver(S) sex links due to their enourmous gene pool, they carry, ER birchen, Dominant white, sex link barring and some may cary blue and mottled(not all of them) so using them that way is useless.. But they are still Sex linked Silver..


but since they carry sex linked Id dermal inhibitor they can also be use as sex links using Fibromelanotic(Id/id+ Fm/fm+ males and id+/- hens, boys having white skin thanks to Id and hens having dark skin thanks to id+)

 

[Fred's Hens]

https://www.backyardchickens.com/t/261208/sex-linked-information


Read post #1 on the thread on the subject by tadkerson

 

[nicalandia]

https://www.backyardchickens.com/t/261208/sex-linked-information


Read post #1 on the thread on the subject by tadkerson

I Know where he says Not to use dominant white birds, that´s a given. but I don´t see him saying White Leghorns are NOT Sex link Silvers.. Heck I´ll P.M him

 

[Fred's Hens]

My post was intended more for the OP. I don't normally engage genetics debates. Far above my paygrade.

 

[BlazeJester]

hi guys. im a newbie in chicken breeding. all i know is that if a colored roo tops a white hen, it'll produce a sex-link. so i'd like to ask if i will create a sex-link using these:
i have 1 'kabir' rooster. a famous dual-purpose type (here in PH). it can lay approximately 200 eggs per cycle and can weigh up to 8.5 pounds, they're like red rangers, good foragers, and good mother. can be broody twice per year.
his pic

and im planning to breed that roo with my WL hens. they're ex-batts actually. recovering very well. im planning to introduce them to my kabir on april when my hens are fully recovered.
her pic.

sounds like they will make some egg-laying machine babies with some common sense thrown in from daddy's genes, which will be excellent regardless of sex link!

do you think they'll produce sex-links? nope thanks

I know that you got these hens from the battery and probably are not looking to add to your flock, but if you are looking to cross that rooster, barred rock hens are very commonly used in black sex links (under a colored roo; see the linked post which explains sex link VERY well). Of course many other breeds already listed by Chris and Fred will work as well.

 

[Fred's Hens]

The OP, I believe, is in the beautiful country of the Philippines. Not sure what options, in terms of different breeds, are readily available.

 

[tadkerson]

Genetics 101

White leghorns will not work in a normal red sex linked cross or a black sex linked cross. White Leghorns carry a gene called extended black. This gene suppresses the production of red pigments in the down of the females so the down is black. They also would carry one dominant white gene which would change the black down to white down. The males will also be white in color. So you produce a bunch of chicks that are white or white with black specks. In a red sex linked cross, the females should have a reddish color in the down and the males should have a whitish color in the down.

Commercial White leghorns are sex linked silver. I do not know where you read that they are not but they are sex linked silver. All the research literature says this and my own experience working with white Leghorns supports my statement.

Chris you are correct that white leghorns are white because of the dominant white gene but in order to make sure no red shows in the white leghorns they also carry silver. The dominant white gene does not inhibit the production of red pigment it only inhibits the production of black pigment ( changes a black bird to a white bird). Take a look at a male red pyle old english game bantam . Red pyle are dominant white and sex-linked gold- the gold allele is producing the red color on a white bird. If the same bird was sex linked silver and dominant white then the male bird would be white.

Almost every female chicken on the planet is sex linked silver or sex linked gold and in the case of males they are almost always sex linked silver, sex linked gold or a combination of sex linked silver and sex linked gold. I say almost because there is also a documented albino allele at the silver locus. If a bird is not silver it is going to be gold (or an albino).

I have crossed a male Rhode island red with white leghorn females and every chick was white or white with black specks- just as the genetics predicted and as Chris stated.

To use a white leghorn in a sex linked cross you have to use some birds with special genotypes to produce offspring that can be sexed by color. And then the color patterns in the down are different than a normal color sex linked cross.

You can use a white leghorn as the female side of a feather sexing cross but not a color cross.

I am not attempting to be a jerk- I just want everyone to know the correct information about genetics and chickens. If some one has a rebuttal, please post your side of the discussion.

Tim

 

[nicalandia]

Genetics 101

White leghorns will not work in a normal red sex linked cross or a black sex linked cross. White Leghorns carry a gene called extended black. This gene suppresses the production of red pigments in the down of the females so the down is black. They also would carry one dominant white gene which would change the black down to white down. The males will also be white in color. So you produce a bunch of chicks that are white or white with black specks. In a red sex linked cross, the females should have a reddish color in the down and the males should have a whitish color in the down.

Commercial White leghorns are sex linked silver. I do not know where you read that they are not but they are sex linked silver. All the research literature says this and my own experience working with white Leghorns supports my statement.

Chris you are correct that white leghorns are white because of the dominant white gene but in order to make sure no red shows in the white leghorns they also carry silver. The dominant white gene does not inhibit the production of red pigment it only inhibits the production of black pigment ( changes a black bird to a white bird). Take a look at a male red pyle old english game bantam . Red pyle are dominant white and sex-linked gold- the gold allele is producing the red color on a white bird. If the same bird was sex linked silver and dominant white then the male bird would be white.

Almost every female chicken on the planet is sex linked silver or sex linked gold and in the case of males they are almost always sex linked silver, sex linked gold or a combination of sex linked silver and sex linked gold. I say almost because there is also a documented albino allele at the silver locus. If a bird is not silver it is going to be gold (or an albino).

I have crossed a male Rhode island red with white leghorn females and every chick was white or white with black specks- just as the genetics predicted and as Chris stated.

To use a white leghorn in a sex linked cross you have to use some birds with special genotypes to produce offspring that can be sexed by color. And then the color patterns in the down are different than a normal color sex linked cross.

You can use a white leghorn as the female side of a feather sexing cross but not a color cross.

I am not attempting to be a jerk- I just want everyone to know the correct information about genetics and chickens. If some one has a rebuttal, please post your side of the discussion.

Tim

I love your 101s Tim, I am not a good teacher even if I try, my words just don´t come out like yours...

Tim seems leghorns carry a second mutation for Silver.

here is nice read
http://www.the-coop.org/forums/ubbthreads.php?ubb=showflat&Number=101948#Post101948