The Mean Staple Length of Wool Fiber Is Associated with Variation in the Ovine Keratin-Associated Protein 21-2 Gene

The study investigated the ovine Keratin-Associated Protein 21-2 (KRTAP21-2) gene in 389 Merino × Southdown-cross lambs, identifying five variants (A-E) and their association with wool traits. Notably, sheep with genotype AC had a 12.5% greater mean staple length (MSL) compared to those with genotype CE. Variant E was linked to lower MSL and higher fiber diameter standard deviation (FDSD), mean fiber diameter (MFD), and prickle factor (PF). The findings suggested that KRTAP21-2 could be a potential gene-marker for improving wool traits, emphasizing the genetic influence on wool characteristics and the potential for selective breeding.