@conference {41724,
	title = {Effect of divergent selection for wool bulk on live weight and wool characteristics in Perendale sheep},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {67},
	year = {2007},
	month = {Jan},
	pages = {180-186},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	address = {Wanaka},
	abstract = {A sixteen year selection trial in a flock of Perendale sheep selected for either increased (H line) or decreased (L line) wool bulk at yearling (hogget) shearing, was undertaken at Whatawhata, and later Winchmore Research Stations. A total of 2,620 progeny sired by 172 rams joined in single sire matings were measured, with data from an additional 664 fleeces providing direct information on base flock characteristics. A restricted maximum likelihood (REML) animal model adjusting for fixed effects of year, sex, birth date and birth/weaning rank was fitted to the data. Heritability estimates {\textpm} standard errors for each of the measured characteristics were; core wool bulk (0.57 {\textpm} 0.03), pre-shear live weight (0.35 {\textpm} 0.04), greasy fleece weight (0.44 {\textpm} 0.04), washing yield (0.42 {\textpm} 0.03), clean fleece weight (0.45 {\textpm} 0.03), staple length (0.54 {\textpm} 0.03), total crimps (0.38 {\textpm} 0.03), crimp frequency (0.46 {\textpm} 0.03), mean fibre diameter (0.62 {\textpm} 0.04), fibre diameter variation (0.58 {\textpm} 0.04) and mean fibre curvature (0.67 {\textpm} 0.04). At the end of the trial, line divergence (H {\textendash} L) in core wool bulk and fibre curvature amounted to 2.5 phenotypic standard deviation units. It was associated with a positive divergence in crimp frequency and a negative divergence in staple length, washing yield and clean fleece weight of +2.1, -1.7, -1.4 and {\textendash}0.8 standard deviation units respectively, and lesser changes in other traits.},
	issn = {1176-5283},
	author = {Sumner RMW and Clarke JN and Cullen NG}
}
