Ok, I understand what you are saying and I agree. I feel like male chicks do have indicators other than not just looking like a female chick. Maybe we need to review the distinguishing characteristics of male chick down colors and features? Though it does seem like male down color and markings are less precise.
Thinking back to Punnett's day -- and looking at his structure for autosexing it seems to me that the genetic keys to autosexing are:
1). the double barring on males and
2). the chipmunk stripes on females. So to get chipmunk -- the chick should be a 'duckwing' pattern. (created by a pair of e+ genes on the E-Locus)
-- I think that some other E-Locus genes have crept into the breed. Some of the other E-Locus genes could give a similar appearance...to the true e+ in chick down. Following the stars is a quote from Henk69- who is a gene genius - and created the chicken gene calculator (it is in 'Classroom in the coop)
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On request a topic about chick down phenotypes and the genotypes to go with it.
We want to keep this topic clean so every off topic remark will be removed!
Kick-off
e+: chipmunk pattern
eb: helmet pattern
eWh: little pattern (overall yellowish)
ER: overall dark pattern, dark legs.
E: penguin pattern
http://www.the-coop.org/forums/ubbthreads.php?ubb=showflat&Number=91532&page=all
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Here is a set of photos in reply showing some various chick down patterns:
Can you see from the above that an eb or an ebc or an eWh -- as one of the pair on the E-Locus could cause a little battle in how the down pattern is expressed? I see it
So back to the Punnett basis:
The double barring produces the white headspot.
Logically -- white head spots should indicate strong barring genes and strong stripes definite duckwing (e+). Think about it.
The males double barring gene - will diffuse the chipmunk stripes and even make the head splotch cause the head-V to look less crisp. On males the light splotch either creeps outside the V or messes it up in my viewpoint.
Also -- perhaps JMO -- the male stripes for a duckwing do not disappear or diffuse entirely to the point that they are absent and non-discernable. I suppose that view could be considered controversial in some circles. ;O)
So definitely selecting for strong autosexing should be possible from chick down........