Since your girls weren't raised with a roo, there may be a rough adjustment period while they get accustomed to the routine. If you are like me, it might be harder for you than for the chickens. Also to consider, do you have young chidren who frequent the chicken area? Even roos who are normally mannerly may get freaked out at the sight of a hyperactive little girl in a red dress bouncing around. (My 6 young granddaughters inadvertantly terrorize my five chickens) And, a roo who is docile in a larger mixed flock may change his behavior once he is king of his own castle.Why take a chance of messing up the happy girls? I vote for no rooster. (But that's just me....
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