I just completed a hatch of 6 RIR's, very outgoing little peeps compared to my last batch of barnyard mixed. My question is this, I have 2 that have 3 dark brown racing stripes down their backs, the other 4 are lighter and have plain backs. Is this difference in any way related to the sex of the chixk, or is it just having different parents. I got the eggs from some farmers who have about 200 RIR's exclusively, so they are all purebred. Thanks in advance.