3 week old Barred rock, black australorps, and RIR's

[bigchrisb1985]

I found were I can buy some 3 week old Barred rock, black australorps, and RIR's for $1.50 each. I need some help before I go and get a few on determining the sex of them when I get there. I read on another post some were on BYC that for RIR you can determine the sex like this
Sexing chicks-4-6wks of age
According to UC Davis Veterinary Care Program.
2. Physical Characteristics (4-6 weeks of age)
a. Comb – The cockerels comb is medium size and pinkish, the pullets is small and yellowish.
b. Legs – The cockerel’s legs are sturdy and long, the pullets are finer and shorter.
c. Tail – The cockerel’s tail is stumpy and curved, the pullets is longer and straight.
d. Back – The cockerel has a thin line of stub feathers down the center of his back, the pullet has more advanced feathering along the center of her back.
e. Side of neck, flank and crop – The feathering in the cockerel in these areas is poorly advanced, the pullets feathering in these areas is well advanced.
f. Wing bows – In the cockerel the wing bows are bare, in pullets the wing bows are covered with small feathers.

I was wondering if these rules apply the the barred rock and black australorps as well. Or if yall have any other info that will help me determine the sex of these chicks when I do to get some. Thanks

 

[speckledhen]

Barred Rock cockerels appear lighter in overall color than pullets. The white bars are wider, which causes that difference.

This brother and sister are two weeks old so you can see the diff--the male is outside the door. He is also less feathered out than sis:

Here they are at six weeks old:

In the other two breeds, I check for thick legs. Some cockerels' combs are starting to turn pink by then, but it's harder than the Barred Rocks with Aussies and RIRs at three weeks old.

 

[bigchrisb1985]

thank you