SS x GLW

[bbond]

I have a headache from reading the color genetics thread already and I haven’t even gotten to anything mentioning a Speckled Sussex yet. Is their speckling a dilution of the lacing gene? I’m hatching a few of these crosses out from my flock (first egg internally pipped this morning!) and I am wondering if anyone knows what colors or patterns I might expect. It is a SS cock over gold laced Wyandotte hen. Thanks in advance!!

 

[EggSighted4Life]

You have to figure out what the actual term for the speckled is for one thing. Maybe @The Moonshiner can help you.

After that, here is a toy to play with (doesn't include speckled)..
http://kippenjungle.nl/Overzicht.htm#kipcalculator

Happy hatching!

 

[The Moonshiner]

The speckles are caused by the mottled gene. Mottling is recessive so it takes two copies to be expressed.
Your chicks will all carry one copy so it won't be expressed on them.

 

[bbond]

The speckles are caused by the mottled gene. Mottling is recessive so it takes two copies to be expressed.
Your chicks will all carry one copy so it won't be expressed on them.

So if i bred F1s to the rooster I could get some f2 mottled? Do you think there would still be lacing anywhere from the Wyandotte?

 

[The Moonshiner]

If bred back to the rooster about half would be mottled. If you breed the F1s together about 1/4 would be mottled.
I'm lacking in knowledge about lacing so don't want to post the wrong info so I'll wait for a couple others to explain that.

 

[The Moonshiner]

@nicalandia
@Sneebsey

 

[nicalandia]

@nicalandia
@Sneebsey

I've been summoned here!

The F1s and Back cross to Speckled Sussex parent line(BC1) will have incomplete lacing(100% in F1 and 50% BC1) that is because the genes required to produce a full lacing bird will be in heterozygous form(Pg/Pg, Ml/Ml) even if Co(Columbian) is in homozygous state(As far as I know SS are red enhanced Co restricted mottled)



Some info from (with updated source link to the work by Smyth 1976) http://www.edelras.nl/chickengenetics/mutations1.html

The following diagram is based on a drawing from the following article by Smyth: Genetic Control of Melanin Pigmentation in the Fowl (1976)- available for download: https://www.poultryscience.org/docs/pba/1952-2003/1976/1976 Smyth.pdf



SS are genetically e+/e+, Co/Co, s+/s+, pg+/pg+, ml+/ml+, mo/mo
GLW are eb/eb, Co/Co, s+/s+, Pg/Pg, Ml/Ml, Mo+/Mo+

The result will be e+/eb, Co/Co, s+/s+, Pg/pg+, Ml/ml+, Mo+/mo

There is a Linkage between Pg-Ml so they don't segregate independently, so even the BC1 will have a 50% chance of being either incomplete laced(incomplete laced with no mottling looking very similar to the F1s but darker and incomplete laced with mottling)

SS are not as popular as RIR so finding actual crosses of SSxLW is not easy but here are some results of RIR x SLW cross(RIR very similar to SS except they don't have mottling and most are based on wheaten chick down)

From Post: https://www.backyardchickens.com/th...old-laced-wyandotte-roo.349906/#post-18042126

From: https://www.backyardchickens.com/th...d-laced-wyandotte-cross.125116/#post-11956647

 

[bbond]

I've been summoned here!

The F1s and Back cross to Speckled Sussex parent line(BC1) will have incomplete lacing(100% in F1 and 50% BC1) that is because the genes required to produce a full lacing bird will be in heterozygous form(Pg/Pg, Ml/Ml) even if Co(Columbian) is in homozygous state(As far as I know SS are red enhanced Co restricted mottled)



Some info from (with updated source link to the work by Smyth 1976) http://www.edelras.nl/chickengenetics/mutations1.html

View attachment 1703832


The following diagram is based on a drawing from the following article by Smyth: Genetic Control of Melanin Pigmentation in the Fowl (1976)- available for download: https://www.poultryscience.org/docs/pba/1952-2003/1976/1976 Smyth.pdf



SS are genetically e+/e+, Co/Co, s+/s+, pg+/pg+, ml+/ml+, mo/mo
GLW are eb/eb, Co/Co, s+/s+, Pg/Pg, Ml/Ml, Mo+/Mo+

The result will be e+/eb, Co/Co, s+/s+, Pg/pg+, Ml/ml+, Mo+/mo

There is a Linkage between Pg-Ml so they don't segregate independently, so even the BC1 will have a 50% chance of being either incomplete laced(incomplete laced with no mottling looking very similar to the F1s but darker and incomplete laced with mottling)

SS are not as popular as RIR so finding actual crosses of SSxLW is not easy but here are some results of RIR x SLW cross(RIR very similar to SS except they don't have mottling and most are based on wheaten chick down)

From Post: https://www.backyardchickens.com/th...old-laced-wyandotte-roo.349906/#post-18042126

From: https://www.backyardchickens.com/th...d-laced-wyandotte-cross.125116/#post-11956647

Thank you so much for this in depth explanation. I’m really looking forward to seeing how the genetics express.