Cuckoo Partridge vs. Cuckoo

We have the impression that our Cuckoo Partridge males are a bit too light in color. In 1999 we hatched some chicks from mixed origin and among them was a dark male that resembled a bit Cuckoo Partridge. We crossed this male with Cuckoo Partridge females (P-generation in the sheme below) in order to get the offspring a bit darker. The F1 generation is from this year hatch and you can see the varieties in colors that came out of it below.

P-generation

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F1-generation

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1x Cuckoo  male

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4x
Cuckoo Partridge Females

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4x
Very light Cuckoo Partridge males

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3x
Cuckoo females

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2x
Dark Cuckoo Partridge Males

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2x
Cuckoo Partridge Males

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1x
Very dark Cuckoo Partridge Male

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1x
All black female