Mutation: Not known
Inheritance: Sex-linked recessive
Pigment change: Albinism?
One of the most recent Australian mutations is sex-linked pewter, that first appeared in 1998 to Lawrence Jackson. This mutation affects the quality of melanin and is very dark, although lighter than normal grey. In certain light the feathers may seem brown, but the tone is darker than cinnamon or other colours known earlier. The colour was named after the way it looks.
In the picture there’s a pewter (left) and cinnamon (right). Here you can see how the pewter’s feet are much darker compared to the cinnamon. Photo: Rick Solis
Females are usually greyer than males, who may remind like very dark, rusty cinnamon. Pewter-coloured birds have a dark beak – althought not as cold toned as the normal grey has.
It was first thought that pewter would be a combination of cinnamon and some other mutation. Lawrence Jackson tested the mutation by combining pewter with cinnamon and platinum, resulting only in normal grey cocks. While examining the pewter mutation it was also found out that it doesn’t reside in the same locus with cinnamon or ino, and therefore is not an allele of either of these genes, but affects completely independently compared to these mutations. Very little is still known about the behaviour of this mutation, because a similar gene has not been found in other pet birds. Therefore pewter is a unique mutation and it’s behaviour must be examined before all the qualities of it’s heritability are known.
Photos: Rick Solis
I have not worked with this mutation!