Abstract
Abstract. Variation in KRTAP6-1 has been reported to affect wool fibre traits in Merino cross-breed
sheep and Chinese Tan sheep, but little is known about whether these effects
persist in other breeds. In this study, variation in KRTAP6-1 was investigated in
290 New Zealand (NZ) Romney ewes sired by 16 different rams. Polymerase chain reaction single-stranded conformational polymorphism (PCR-SSCP) analysis revealed four
variants (A, B, E and F) of KRTAP6-1, and nine genotypes (AA, AB, AE, AF, BB, BE, BF, EE and FF) in these
ewes. Among the 243 ewes that had genotypes with a frequency of over 5 %
(i.e. AA, AB and BB), the presence of A was found to be associated with reduced
mean fibre diameter (MFD) and increased coefficient of variation in fibre
diameter (CVFD), whereas the presence of B had a trend of association with
decreased coarse edge measurement (CEM). A genotype effect was also detected
for MFD and CVFD. No associations were detected for fibre diameter standard
deviation (FDSD), mean fibre curvature (MFC) and medulation. These results
suggest that variation in KRTAP6-1 affects wool fibre diameter in NZ Romney ewes,
confirming the finding in Merino cross-breed sheep.
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