[ratbasket]

My female black berkshire rat now has some cinnamon colored looking fur around her neck and back, it is very sparse. Can females get buck grease?

 

[LilCritter]

I have also been having this problem. I heard that it could be indicative of a copper deficiency?

 

[Isamurat]

It's rusting. It can be caused by genetics, sun exposure and copper deficiency. Some rusting is normal in older Black rats. i tend to treat as a copper deficiency and if extra copper doesn't fix it assume it's not an issue. liver is probably the best source of copper out there