Like everyone else here, I’m still trying to figure out the dos and don’ts and have been focused on how (and what) to breed in hopes of improving the blue Ameraucana. One thing I think is important when crossing blacks into the mix is to try and only use the blacks that have been hatched out of blues and carry the silver (S) gene. I also believe (but is not fact) that the blues you see that look muddy or dirty could be a result of them having a gold (G) gene parent. If you must combine them for some reason (if that’s all you have) there are ways around it.
When I first started breeding Ameraucanas, I started with a blue male and a black (G) female. Females will only take their daddy’s gene, while males will take a gene from both…so I was told. If you are trying to create a blue (S) pen, only keep the blue females from a cross like that (since she only has daddy’s gene) and only keep the black males from that cross if working towards your black (G) pen, then either cross the black back to his mother or a (G) female you’ve purchased from someone else.
I am currently trying a project using a black (G) male with a splash (S) female in hopes of getting the awesome qualities I have in a particular black male I got from Clif, into my blue pen. This male is as gentle as they come, has a straight comb, and is as wide as he is tall. I REALLY want his qualities added into my blues so I bred him to splash hen (that is out of a blue male that has really nice lacing/edging), so hopefully she carries that, too. Although all chicks will be blue, this chick (hoping it’s a male) carries both parent’s gene and then I will cross him back to a well laced blue and keep them all in my blue pens. I would not keep or breed back to a blue female out of this cross since she would only carry her daddy’s gold gene.
When breeding for good blues, I personally prefer to breed blues to blues since I can see what I’m dealing with, but I have also kept splash and black (S) if I like other qualities about them. This is just information (whether true or false) that I feel I have learned by trial and error and hope that it is helpful to others.