My blue roan had her first season 2 weeks before her 1st birthday, but her sisters.....one had her first at 9 months, the other only just at 16 months!
I know my Poppy (blue roan) had a browny tinge to her fur as a pup, her mum is orange roan, dad blue roan, so I guess the orange/brown is a bit of her mum.........but since her adult coat has come through it's a lot less, can only see a glimpse of it in the sunshine