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F1 cock in first pic, F2 stags in second and third pics.
After I made my F1 cross of aseel cock to Liege hen I thought that [size is sex-linked] was the case. All of the F1 and F2 male offspring grown out both in my care and in the care of others came out in the 6-7lb range with little room for additional growth into their second or third years. The F2s were produced by breeding the F1 cock back to the Liege, making 3/4 Liege offspring.
I have recently produced 2 F2 stags that appear that they'll be the size of a Liege rooster when mature based on their current sizes and rates of growth. There was no Liege rooster used in their creation so now I no longer suspect that the rooster size is sex-linked.