The "Ask Anything" to Nicalandia Thread

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I am new to breeding/genetics but find it really fascinating. I recently purchased bbs pure ameraucana eggs from a local breeder. They are due to hatch tomorrow. This week she found out some concerning news. Her blue ameraucana roo, who always produced pea comb SOP babies with other ameraucana pure hens, sadly made all babies with straight combs when that same roo was mated to a maran hen for olive eggers. This was the first time she bred outside of using her ameraucana hens. My questions are: is this concerning and does this make that said blue ameraucana roo not a pure bred? Should I not use the babies from this blue roo mated with the pure ameraucana hens for my ameraucana breeding project?
 
I am new to breeding/genetics but find it really fascinating. I recently purchased bbs pure ameraucana eggs from a local breeder. They are due to hatch tomorrow. This week she found out some concerning news. Her blue ameraucana roo, who always produced pea comb SOP babies with other ameraucana pure hens, sadly made all babies with straight combs when that same roo was mated to a maran hen for olive eggers. This was the first time she bred outside of using her ameraucana hens. My questions are: is this concerning and does this make that said blue ameraucana roo not a pure bred? Should I not use the babies from this blue roo mated with the pure ameraucana hens for my ameraucana breeding project?
I will let the experts weigh in on the genetics aspects, but it’s possible his lineage may have been crossed in the past, but I think it only means he has one copy of the pea comb? So when bred to other true Ameraucanas with two copies you will always get pea combs…it’s probably something to be aware of but I don’t think it means you can’t show them and breed them as true? I could be wrong though? Showing is about looks and breeding is about honesty…so if you sell them I’d just make sure it’s known that it’s possible! :)
 
I will let the experts weigh in on the genetics aspects, but it’s possible his lineage may have been crossed in the past, but I think it only means he has one copy of the pea comb? So when bred to other true Ameraucanas with two copies you will always get pea combs…it’s probably something to be aware of but I don’t think it means you can’t show them and breed them as true? I could be wrong though? Showing is about looks and breeding is about honesty…so if you sell them I’d just make sure it’s known that it’s possible! :)
I agree with this, but I’m not an expert either. I am curious on the expert’s weigh in. My thought is if the mother ameraucana is P/P (pea comb dominate), and that roo being most likely a P/p (Pea comb dominant/ single recessive), the punnet square would indicate 50 percent of the babies hatching tomorrow could inherit P/P, therefore eliminating the recessive gene? That is, if you picked the right ones with the genes to continue the breeding program with.

And I agree with your thought process on what the bird shows and discourse to potential buyers if decided to keep the babies in the breeding program. Thanks for your input!
 
blue ameraucana roo, who always produced pea comb SOP babies with other ameraucana pure hens, sadly made all babies with straight combs when that same roo was mated to a maran hen for olive eggers.
Those olive egger babies: are they just little chicks, or are they fully grown up?
How many are there?

If the Ameraucana LOOKS like he has a pea comb, it should be impossible (genetically speaking) to get a large number of chicks that ALL have single combs. Worst case, it should only happen in half of his chicks with a single-comb hen.

The way I would expect it to work:
If you cross a chicken that is pure for the pea comb gene (Ameraucana rooster), to a chicken that is pure for single comb (Marans), each chick will be split pea/not-pea. That tends to cause some odd-looking combs, that are not the normal pea combs but are not normal single combs either. They tend to be taller than a normal pea comb, but wider and blobbier than a normal single comb, and there can be quite a bit of variation. If someone is used to pea comb chickens, they might think those combs are single combs, even when they are not. I think that is the most likely explanation, although of course I could be wrong.
 
The way I would expect it to work:
If you cross a chicken that is pure for the pea comb gene (Ameraucana rooster), to a chicken that is pure for single comb (Marans), each chick will be split pea/not-pea. That tends to cause some odd-looking combs, that are not the normal pea combs but are not normal single combs either. They tend to be taller than a normal pea comb, but wider and blobbier than a normal single comb, and there can be quite a bit of variation. If someone is used to pea comb chickens, they might think those combs are single combs, even when they are not. I think that is the most likely explanation, although of course I could be wrong.

This goes the same for rose combs, right?

I'll be working with Australorp x Wyandotte for my Silver-Laced Australorp(ish) project. I've got one single-combed SLW to use, but the other SLW is rose-combed.
 

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