This is MY UNDERSTANDING of autosomal red from the Poultry Colors Genetics book by Sigrid Van Doort but I am not absolutely sure it this is how it works.
Supposedly, this is what Autosomal Red does to silver. Here pictured: silver Phoenix hens. Without the autosomal red you get silvery breasts. With it, you get proper red breasts. This is why silver is so hard to breed, because the standard calls for silver shoulders on males (no autosomal red) and red breasts of females (autosomal red.) Further complicated because homozygous autosomal red often causes browning on the back of females which should have silver.
Supposedly, this is what Autosomal Red does to silver. Here pictured: silver Phoenix hens. Without the autosomal red you get silvery breasts. With it, you get proper red breasts. This is why silver is so hard to breed, because the standard calls for silver shoulders on males (no autosomal red) and red breasts of females (autosomal red.) Further complicated because homozygous autosomal red often causes browning on the back of females which should have silver.
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