The dun gene is found in US birds and is used to make the varieties named chocolate, khaki & fawn. Chocolate is one copy of I^D, khaki is two and I think fawn is, but am not certain of that.
The choc gene is a sex-linked recessive gene. The chocolate colour it makes is a bit different than that made with dun.
The choc gene is a sex-linked recessive gene. The chocolate colour it makes is a bit different than that made with dun.