Merle is a version of color-on-color (like splashed) and (also like splashed) exists in Europe (recently imported by a friend of mine). If it makes its way to the UK in the next few years I wouldn't be surprised.
Merle is one of those varieties that people disagree with. Some say it's dominant and some say it's recessive. And both groups will swear with their lives that they're right because they've bred it and have test litters to prove it, which makes me think there may actually be 2 different (or similar) genes which create merle mice depending on location (like there are 2 genes which can create red/yellow mice depending on location).
I've never bred merle. It has too many problems with breeding to standard. You might try asking on an American forum. I know a few people who have bred merle but who don't belong over here to the best of my knowledge.
That said, if your mouse isn't merle, you can't "create" it from roan. You have to start with a merle mouse.
This is the website of the lovely Dr Roland Fischer form Germany. He has merles (pictures on this website) and we were discussing it on Saturday at the show. Roland reckons that merle is a recessive gene, and certainly his merles breed that way.
I am a friend of his, and I have discussed it with him in the past... I am dying for some of his splashed/tri colour and merles... though he is a bit resistant to letting merles go because they are not good enough in his opinion lol
It would cost alot. Which is what is stopping me honestly.
I think some have made their way to the Netherlands by now, too. My friend Christine sent some there but I'm not sure if any were merle.
I am hopefully coming to London in a couple years and if I can at all afford it, I plan to take mice with me (American brindle, merle, splashed/tri) and bring some back (Red, rumpwhite, pearle). If I can't afford it, I probably will just keep saving up till I can since that's my main reason to go.
Yeah, it takes months of planning but not as much as it might because mice are exempt from a lot of US laws due to their status as lab animals (labs import animals or parts of animals all the time). It costs around USD $1000 at the very least to import mice from Europe. I know some people who paid over USD $5000 by the time everything was said and done. I hope it's easier for y'all to do inter-Europe importation!
well there are no quarantine rules from countries in annexe A of this document which includes germany and the netherlands.
When you get to customs, you complete a form to decare them. You can pay carriers to do this;