The quantifying of flue quality in ostrich plumes with special reference to the fat content and cuticular structure of the Barbu

The chemically determined fat content (ether extract) and the cuticular structure of the fibres (barbules) of ostrich plumes were related to the 5 standardized categories of subjectively evaluated fatty appearance as used in practice. With regard to the quality traits of the flue, the cuticular structure of the barbules was also compared with the surface structure of the fibres of mohair and Merino, Dohne Merino and South African Mutton Merino wool. No evidence was found of any significant relationship between subjectively evaluated fatty appearance and the ether extract of the ostrich plumes or for wool. On the other hand, it was found that the softness lustre and fatty appearance of ostrich plumes, wool and mohair are caused by the degree of smoothness of the cuticular structure of the fibres.