Black mottled x partridge color genetics question

[shelleyd2008]

I traded a pair of mottled cochin youngsters for 2 partridge cochin pullets at the IN chickenstock the other day. The only bantam cochin roos I have are black mottled. I was wondering if I can cross them, or would they just be mixed colors? It would be neat to have a mottled partridge

 

[nzpouter]

2nd generation...

 

[ve]

Black is dominant to partrige.Mottled is recesive to non mottled.You can breed them.In F1 you will have only black birds.From mating F1 to F1 you can have 25% partrige and 25 % of them can be mottled.

 

[Krys109uk]

mating F1 to F1 you can have 25% partrige and 25 % of them can be mottled.

It's slightly more complicated than that. Presuming that the mottled is 'pure' regarding plumage genes for those colours, breeding the F1s together would give odds of getting a bird which is pure for both pattern gene & mottling would be one in sixty four.​

 

[shelleyd2008]

Okay, so black is dominant, and mottling is recessive. So theoretically, all the F1 chicks would be black/partridge x and each should have a gene for mottling. I have 2 young cockerels that are black mottled, hatched from my black mottleds, so I know they are pure for mottled.

So since the mother should be pure for partridge, and the father is pure for black mottled, the chicks would all look black, but carry a partridge gene and a mottling gene, correct? So breeding F2 together should result in some black, some partridge, some black mottled, and some partridge mottled, is that right??

So it wouldn't technically be 'mixed colors', they would be a project?

That's what I was hoping for!! So then how would I continue to work on the partridge mottled? Hope like heck that I get a partridge mottled pullet and cockerel, then put them together?

 

[Krys109uk]

So since the mother should be pure for partridge, and the father is pure for black mottled, the chicks would all look black, but carry a partridge gene and a mottling gene, correct? So breeding F2 together should result in some black, some partridge, some black mottled, and some partridge mottled, is that right??

It's more complicated than that. Actually when I think about it the odds are probably less than one in sixty four being a mottled partridge, because I'd forgotten black's melanising genes.

Black isn't just one gene. It is usually extended black (E) or birchen (ER) or a combination of the two. Black can also have a lot of other colours underneath; sometimes black is silver rather than gold. Black is also a combination of melanising genes to make the bird black. Then, of course you've got mottling (mo).

Then our partridge bird is a brown bird (eb) which is recessive to extended black & birchen, it is also 'pure' for pattern gene (Pg) & is gold (s+). In US I think they've also got mahogany (Mh).

So you might get a bird which is 'pure' for eb & Pg, s+ & mo but it may also have other unwanted genes.​

 

[AndyCap]

Hey all, i know this is an old thread, but i was doing some searching for pictures of mottled partridge and couldnt find any, but did find this thread.

Mottled partridge are gorgeous little things, i have just hatched one from a Partridge male and female mating, both carrying the mottling gene, here is the little girl with her sister, who is a plain partridge.




The same partridge male gave me this black mottled, from a cross to a black hen for type improvement, so kind of the opposite of what you were trying to achieve!

 

[Henk69]

It is even more complicated than stated above. There is a not too tight linkage between the extended black/partridge gene and the mottled gene. This gives an even smaller chance on mottled Partridge.

 

[AndyCap]

It is even more complicated than stated above. There is a not too tight linkage between the extended black/partridge gene and the mottled gene. This gives an even smaller chance on mottled Partridge.

Thanks Henk,

So i was very lucky to get the mottled partridge. I only hatched two eggs from the pair, one pullet was mottled, the other pullet normal.

 

[AndyCap]

just found a great thread on this, according to some genetics buffs, the percentages should be

51.69% black
23.31% Partridge
23.31% Black mottled

and only 1.69% Partridge mottled.

So it seems if the linkages are similar for me, that i was extremely lucky to get a mottled partridge out of only two eggs hatched.