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A cock with silver phenotype can be either heterozygous silver or homozygous silver. A gold cock is a gold cock because gold is recessive.

This is not an issue of ig or Ig+. Silver 55 male- B/B, S/S, k+/k+, e+/e+, mo/mo Silver 55 female- B/-, S/-, k+/-, e+/e+, mo/mo Gold 55 male- B/B, s+/s+, k+/k+, e+/e+, mo/mo Gold 55 female- B/-, s+/-, k+/-, e+/e+, mo/mo The first 3 in each being Z chromosome and the second 2 being autosomal.

Thats a gold male and silver female.