Black chick

[Butterscotchbitesfinger]

Lol how bout mystique? I still don't know why the down feathers so short the rest of the chicks so fluffy.

Good idea LOL

 

[Ridgerunner]

The original half breed leghorn was full white with big eggs almost white but not quite. Will I get more black chicks from this one if its a pullet? Also why is the fur so short? And the legs beak and comb are also black

How well do you understand basic genetics? It's a little more complicated than just dominant or recessive genes, there are some that an incompletely dominant. That's where if one incompletely dominant is at that gene pair you one reaction, if both are incompletely dominant you get a different reaction. That's probably not in play with your situation but some genes only have a reaction if another specific gene is present. I think that is relevant to you.

It sounds like you don't know what breed or color the other parent of that leghorn mix is. Knowing that could help a lot with this. It sounds like she got Extended Black and one gene of Dominant White from her parents. Extended Black often causes feet and other areas to be dark. Dominant White is one of those genes that only acts if another is present. Dominant White changes feathers that would normally be black to white. Both of those are dominant. So if she has just one of each she will be white. If she has two Extended Black and one Dominant White she will be white.

It also sounds like she may have barring. You can't see barring in a solid white chicken but some breeders put barring on a white chicken as it makes the white look even more white. In any case it is masked by white, you don't know if a white chicken has it or not. Barring is a sex linked gene. A pullet can only get barring from their father. A pullet cannot get it from her mother. A cockerel can get barring from either its father or mother. So if the pullet has barring and your three roosters do not then you are making sex links, provided the barring can be seen in the colors you get. You don't know if her brother has barring or not if he is white. You don't know if the Cornish Cross has barring or not as he is white. You should be able to tell by looking if your red rooster has barring. There are so many unknowns here that this does not help you determine who the father is.

Assuming the Leghorn mixed hen has Extended Black and one copy of Dominant white, if her chick inherits Extended Black but not the Dominant White she will contribute the genetics to make a black chick. If her brother is the father, those genetics could come from him instead of her. So it is possible her brother is the parent.

If the Cornish Cross rooster has Extended Black and Dominant White he can't be the father, that would give you a white chick. But if he is based on Recessive White he could be the father.

The red rooster could be the father as her dominant Extended Black and Dominant White would overpower the red rooster's genetic contributions.

If the unknown parent of the mixed Leghorn and her brother contributed Recessive White I can come up with a Scenario where the red rooster is the father but not where either of the other two are, provided the mixed leghorn's brother is white.

There are other ways to make black other than Extended Black. You can't be 100% sure that you don't have Recessive White instead of Dominant White. But I think you are most likely dealing with Extended Black and Dominant White. In that case, depending on who the father is, that chick has the genetics to have black chicks. Being a mix with unknown genetics for the other half of those gene pairs it is also possible that chick could have the genetics to have offspring of many different colors and patterns, depending on which gene at that gene pair is inherited.

To me that is a big part of the fun of hatching mixes, you just don't know what you will hatch.