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RESEARCH ARTICLE

The relative importance of sources of variation in fibre diameter for Australian Merino sheep

AA Dunlop and PR McMahon

Australian Journal of Agricultural Research 25(1) 167 - 181
Published: 1974

Abstract

Variation in fibre diameter was estimated in five Merino strains under the headings: between sheep; between sites over the body of the sheep; between fibres within sites; and between points along the fibre.

The variation between fibres constitutes some two-thirds of the total, and that between sheep, on which the classer can operate, is about one-fifth. By means of correlations between crimps per inch and fibre diameter together with selection differentials, the differences in fibre diameter which a classer is likely to achieve in making clips into two and three lines respectively were estimated. These were less than 1 µm in all cases. Between-line variances computed on the basis of these between-line ' differences in fibre diameter will reduce the total variance within a resulting line by fractions that are always less than 2%. It is concluded that the elimination of crimp-based classing should not produce bulk wools that are unacceptable on the basis of variation in fibre diameter.

https://doi.org/10.1071/AR9740167

© CSIRO 1974

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