Aussie Finch Forum

Can some one assist.
I have a few Fawn javas and 2 young have moulted out as what I call pieds????
The young are now fully adult and are white except they have a fawn rump and brown tails.
Is this a common mutation as I can not recall ever seeing fawn pieds,grey pieds yes but not fawn.
Any help would be welcome.

sorry cant help at all. have never kept javas.
hopefully someone here will be able to

I bred a couple of pied fawns 2 seasons ago. They hatched with the red eyes indicating the fawn mutation and fledged with a fair amount of fawn but moulted almost white with only a small patch of fawn in the shoulder area. Other than these, I haven't seen any since.

I am so jealous. I love both pied and fawn Javas and do not have any fawns. My almost white hen (slight muddieness at rump running into tail) and her normal mate produced a 75/25 white/grey pied. Hoping for another nest soon as dad is starting to show considerable interest in the greens again. Fawn is I understand, sex linked. But pied is one of the more complicated genetic mutations, as some pieds are dominant and some are recessive and I don't know which applies with Javas or if Javas like Budgies can have both types of pieds. Please put up pics of parents and off spring or a description of each bird and I will see if I can work things out.
LML

I'm not so sure of the genetics of the fawn mutation. The pair I had that threw the pied fawns were a normal grey male and a pied almost white female. That pair produced fawn cocks as well so it mustn't be sex linked, although I originally thought the same.

If she is a pied fawn hen only the sons would be fawn if it is sex linked as I always understood it to be. Or if she is a normal grey pied and he is a split fawn only the daughters would be fawn. If neither is visually fawn and you are getting fawns of both sexes, then it must be a recessive which would be unusual. But that's the fun thing about bird genetics some types have different modes of inheritance than others. Unless of course there was a fawn cock in the cage and she was playing away from home.
LML

The hen was a pied grey with black eyes and there were just the two of them in a breeding cabinet so I conclude that they were both split for fawn and the mutation is recessive.

Has to be the case. Unless you have a million to one chance spontanious mutation. Which is how all new mutations begin.
LML

You got my genetics is facinating thing going so I Googled Java Finch Genetics. Sorry I'm no good at putting links on but if you look at www.justjavas.co.uk this shows how it works pictorially and confirms that fawn in Javas is recessive.
LML

finchbreeder wrote:Sorry I'm no good at putting links on

yes you are it worked fine

another link to Java site
http://www.javafinch.co.uk/site/site.html