Relationships between staple strength and other wool characteristics of Romney ewes

Hawker, H. W.; Littlejohn, R. P.

doi:10.1080/00288233.1989.10423466

Cited by 7 publications

(1 citation statement)

References 3 publications

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“…Reduced MFD of wool from August-lambing ewes over the winter months (during pregnancy) would also contribute to their decreased tensile strength (Ross 1965;Hawker & Littlejohn 1989). There was, however, no difference in MFD during the later stages of the trial (Days 307-392).…”

Section: Wool Quality Traitsmentioning

confidence: 77%

Effect of lambing policy and ewe breed cross on wool growth patterns and wool quality

Morris

McCutcheon

Blair

et al. 1994

New Zealand Journal of Agricultural Research

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Section: Wool Quality Traitsmentioning

confidence: 77%

Effect of lambing policy and ewe breed cross on wool growth patterns and wool quality

Morris

McCutcheon

Blair

et al. 1994

New Zealand Journal of Agricultural Research

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Prediction of fleece insulation after shearing and its impact on maintenance energy requirements of Romney sheep

Cottle

Pacheco

2017

Small Ruminant Research

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Wool staple tenacity in New Zealand Romney sheep: heritability estimates, correlated traits, and direct response to selection

et al. 2012

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A flock of New Zealand Romney sheep was established and selected as yearlings on the basis of fleece staple tenacity. The foundation flock was screened from contributing source flocks, with outliers of high or low staple tenacity as yearlings relative to the source flock mean contributing to a ‘high’ line and a ‘low’ line, respectively. A randomly selected control line was established because staple tenacity was known to be affected by yearly changes in feed supply. Staple tenacity of yearling fleeces was found to be heritable (0.41 ± 0.03). After 10 years of within-line selection, the line selected for increased staple tenacity had staples 53% stronger (33.9 N/mm2) than the control (22.1 N/mm2), while staples were 38% weaker in the line selected for decreased staple tenacity (13.8 N/mm2). Staple tenacity was genetically (0.67 ± 0.04) and phenotypically (0.44 ± 0.02) correlated with fibre diameter, and also with staple length (0.38 ± 0.07 and 0.32 ± 0.02, respectively). Longer, thicker fibres likely contributed to positive genetic (0.31 ± 0.07) and phenotypic (0.29 ± 0.02) correlations between staple tenacity and clean fleece weight. The indirect aim of selection was to improve fibre length after carding. Pooled wool samples were prepared from selection line groups of yearlings within sex each year, and a relationship between fibre length after carding measured on these samples and mean staple tenacity of the groups was observed (R2 = 0.514, P < 0.001). Within the tenth (last) year of selection, the high staple tenacity line produced the longest carded fibres (Hauteur: 103 mm) and the decreased staple tenacity line produced the shortest (87 mm), with the control line intermediate (96 mm).

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Relationships between staple strength and other wool characteristics of Romney ewes

Cited by 7 publications

References 3 publications

Effect of lambing policy and ewe breed cross on wool growth patterns and wool quality

Effect of lambing policy and ewe breed cross on wool growth patterns and wool quality

Prediction of fleece insulation after shearing and its impact on maintenance energy requirements of Romney sheep

Wool staple tenacity in New Zealand Romney sheep: heritability estimates, correlated traits, and direct response to selection

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