If the bird is from the European continent, lemon or citron ( which means lemon in a few languages) or citroen (dutch bantams) refers to the cream gene. That is why I would use a bird that carries the cream gene. The cream color is not actually yellow but a pinkish color. It is hard to...
You can make it but you would have to out cross with a breed that carries the cream gene- cream light brown dutch; the only bantam I know of that carries the cream gene. It would take years to produce. The cream gene is recessive so it takes longer to produce offspring that are cream. Since...