Genetics Question

[JustOrpsNC]

I'm trying to figure out which rooster to keep to achieve my goal. My goal is to have as many mottled chicks as possible and for all roos to be black and hens brown. 2 questions:
1. If I put black roo split to Mottled and chocolate over a chocolate hen it will give me what?

2. If I put black roo split to Mottled and chocolate over a chocolate Mottled hen I get what?

 

[SunHwaKwon]

I played around with it for a while with the genetics calculator, but no matter how I manipulate it option 2 gives all mottled/pied, with a 50/50 split for each sex between black and chocolate. Option 1 does the same just with no mottling being passed on. I even tried manipulating the silver v gold but those did not affect the pattern/color to make autosexing chicks.

 

[JustOrpsNC]

Ok, yea I could not figure out the calculator thing. I'm thinking if I put a black roo split for mottled over a chocolate hen/choc hen split to mottled. It will give me black roos and chocolate hens and I can easily tell hens and roos apart?

 

[SunHwaKwon]

No, I tried that.

 

[SunHwaKwon]

Chocolate and black are not sex linked colors, and neither is mottled. You would need something like silver v gold or barred v nonbarred.

 

[SunHwaKwon]

Though now that I think about it, I had a rooster and a hen that were brother and sister. He was black tailed white Japanese and she was brown tailed white japanese. The babies were autosexing, but I really don't know the genetics of the parents. I think they were only half brother and sister but I don't know for sure. I think silver and gold were at play, though.

 

[SunHwaKwon]

Here are a couple resources on sex linked, and autosexing.

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

https://scratchcradle.wordpress.com/2012/08/26/gms9-autosexing-recipe/

 

[The Moonshiner]

I'll start with the mottled gene.
1. Half chicks will be split for mottled and half will have no mottled genes. They will look the same.
Wouldnt be my choice if breeding for mottled.
2. Half chicks will be mottled and half split for mottled.
Better way to go.
Chocolate is sex linked.
With both options your breeding a split rooster to a chocolate hen.
All cockerels will get a choc gene from tneir mother. Half will get one gene from father and half wont.
Your cockerels will be half chocolate and half split to chocolate.
Pullets will only gene gene from father so half will be chocolate and half will be black with no chocoloate genes.
To get sex link you need to breed a chocolate rooster to a black hen. Pullets will get choc gene from father and all will be chocolate. Cockerels will get one choc gene from father but none from mother so they will all be split to chocolate. Black

 

[SunHwaKwon]

I didn't even check to see about using a chocolate male! Good info.

 

[The Moonshiner]

Ya.
You have to have a chocolate rooster or one that is split to chocolate to produce any chocolate chicks.
If the OP were to use a mottled chocolate rooster over mottled black hens they would end up with mottled black cockerels (split to chocolate) and mottled chocolate pullets like their goal.
Could also replace either with a split to mottled and end up with half mottled and half split to mottled.