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The head spot method is one way. If you search here on BYC or Google head spot sexing of Barred Rocks you'll get more reading material than you can probably absorb in week. LOL
The "sheen" of the fuzz is somewhat distinctive. After you've hatched out a few hundred of these chicks, your eye begins to note the difference. The males will feather in with distinctive, bright white barring, while the females will remain quite dark and their barring is less bright in appearance. This is due to the males possessing two genes while the females only carry one gene for barring. Black staining on the legs is also a clue, but isn't reliable unto 3 or 4 weeks as the males legs will often yellow up much sooner. The females also grow their tails longer, quicker.
At 7 weeks, the feathering comes in enough to check your eye, if you tagged them. You'll be right about 95% of the time.
At 9 weeks, the difference between the males and females is night and day.


The "sheen" of the fuzz is somewhat distinctive. After you've hatched out a few hundred of these chicks, your eye begins to note the difference. The males will feather in with distinctive, bright white barring, while the females will remain quite dark and their barring is less bright in appearance. This is due to the males possessing two genes while the females only carry one gene for barring. Black staining on the legs is also a clue, but isn't reliable unto 3 or 4 weeks as the males legs will often yellow up much sooner. The females also grow their tails longer, quicker.
At 7 weeks, the feathering comes in enough to check your eye, if you tagged them. You'll be right about 95% of the time.
At 9 weeks, the difference between the males and females is night and day.