Wing Sexing?

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It can be any breed, not just certain breeds. You have to breed slow feather male to a fast feathering female. Here is an article on it that explains how they do it.
http://www.dpi.qld.gov.au/27_2712.htm

From that article:

Feather sexing

In 1969, after three years of intensive genetic research, Tegels Poultry Breeding Company developed broiler chickens that could be feather sexed. The result was a strain that would produce slow-feathering males and fast-feathering females.

In the slow-feathering males the coverts are either the same length or longer than the primary wing feathers. In the fast-feathering females, the primary wing feathers are longer than the coverts. This is caused by a gene located on the sex chromosome where slow feathering is dominant to rapid feathering and controls the rate of wing and tail feathering in the chicken. The dominant slow-feathering characteristic is passed from mothers to their sons and the rapid feathering characteristic from the fathers to their daughters.
Advantages of feather sexing include:

* increased rate of sexing (feather sexing is faster than machine sexing)
* 99% to 100% accuracy, which means lower labour costs (feather-sexing training requires less time than machine sexing)
* easily transferable skills.

Wing-feather sexing of day-old chicks

Sexing day-old chicks by differences in the formation of wing feathers (see diagram).​
 

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