I haven't had any trouble breeding red brindles.I used to have all champagne and silvers which to my eyes were very beautiful.The combination of brindle and large
pale selfs proved to be difficult though and I've only got two left after battling on for a few years.The pale brindles often produced only one litter or litters with very few brindles.The reds manage 3 litters quite often so numbers at worst remain static and every now and again I have a brindle baby boom from them.
Sarah yours will be Ay, that's just the name for dominant yellow i.e. our reds and fawns. In the US they also have recessive yellow (e).
I like the red brindles, as I do the fawns. I think they are one of the most striking colours in brindles. Agouti, black, blue and chocolate are pretty poor as Sarah says because as they age the brindling disappears until they look like a poor example of their colour.
I like argente brindles, they look good with the white markings. However I haven't had any the 'right' colour because the argentes I got from another breeder just would not produce. I have got argente brindles that are a bit pale, and they are attractive despite this.
its been bred from silver greys but the colour is a bit light.S.greys aren't popular which surprises me ,they always have lovely black beady eyes and are rather pretty.Moult marks hold them back from being winners though so I suppose thats the reason.I have quite a few in a range of shades.