Marking

Cap stripe

Not a standardised variety in the UK, but cap-stripes have been exhibited in some US rat clubs, though they’re not currently recognised for showing. There are no plans to recognise them in the UK or anyone breeding them for show, as far as I am aware.

There are two distinct types of cap-stripes. The first is to do with the chinchilla white spotting gene, and is a combination of that with markings on the H locus. This combination can be prone to megacolon in some lines, especially in the US. The other is a combination of the UK roan gene again with H-locus marking genes, which can give a cap-stripe effect – this marking will roan out as the rat grows.