My rabbits coat has turned yellow
Does anyone know why their fur turned yellow?
What color was the coat to start with?
I'm pretty sure the reason is sunlight, which 'rusts' the pigment in the fur. Black turns brown, brown fades to a brassy color...perhaps this is what you're noticing? If so, at the next molt, the fur will grow in bright and renewed. To prevent rust, you'll need to figure out how to provide substantial shade for the rabbits.
Hope this helps.