Feather keratin gene
F-KER gene g.710T>G
Required genotype | F-KERTT on long-distance flights |
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A fourth and newer quality marker is a polymorphism in feather keratin (F-KER). The F-KER mutation is a g.710T>G polymorphism in the keratin gene, which gives rise to a cysteine-to-glycine amino acid substitution at position 83 (Cys83Gly) in the protein.
The result of the point mutation is a malformation in the keratin protein and is said to have a negative impact on performance of racing pigeons on long-distance flights. The F-KERTT variant (wild type) occurs significantly more in successful pigeons on long distance flights (>500 km) than the F-KERGG variant.
The homozygous GG variant is rare in all pigeon populations but is found more in racing pigeons than in show pigeons (more than 3 times). The F-KERGG variant occurs in less than 5% of racing pigeons.
The fact that there are some well-known top pigeons that possess the G allele, despite the negative effect on performance, proves that using only this genetic marker is insufficient to breed a top pigeon. On the other hand, this may mean that there is still a possibility of genetic improvement with genetic markers, especially in the high-end segment.
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