An Instrument for the Rapid Automatic Measurement of Fiber Fineness Distribution

Lynch, Leo J.; Michie, N. A.

doi:10.1177/004051757604600907

Cited by 59 publications

(21 citation statements)

References 9 publications

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“…Clean fleece weight (YCFW and ECFW) was calculated from the product of GFW and YLD for each fleece. Mean fibre diameter (YFD and EFD) and fibre diameter variation (YFDSD and EFDSD) were measured by Fibre Fineness Distribution Analyser (Lynch & Michie 1976) and later by Fineness Distribution Analyser. Beginning in 1982, with the development of suitable instrumentation, each sample was also measured for loose wool bulk (YWB and EWB) (Bigham et al 1984a) and for Commission Internationale de l'Eclairange (CIE) brightness (YY and EY) and CIE Z values (Bigham et al 1984b).…”

Section: Traits Measured or Calculatedmentioning

confidence: 99%

Single trait selection for yearling fleece weight or liveweight in Romney sheep—correlated responses in liveweight, fleece traits, and ewe reproduction

Morris

Johnson

Sumner

et al. 1996

New Zealand Journal of Agricultural Research

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An experiment was carried out to study direct and indirect responses to selection in Romney sheep. There were two selection lines, one selected for greasy fleece weight (GFW) and the other for liveweight (LW), maintained alongside a control line (CO). Data from lambs born in 1967-90 were analysed to quantify the correlated responses to selection. By 1990, there had been an average of nine generations of selection with an average generation interval of 2.7 years. The correlated responses analysed included yearling and ewe greasy and clean fleece weights, washing yield, yearling and ewe fleece quality traits (staple length, mean fibre diameter, fibre diameter variation, loose wool bulk, Commission Internationale de l'Eclairange (CIE) Y value (brightness) and CIE Y-Z value (yellowness)), birth weight, weaning weight, yearling liveweight, ewe pre-mating weight, and ewe reproductive rate (fertility, litter size, weaning percentage, and lamb survival). Correlated responses were estimated as the deviation of selection lines from the CO line, and genetic correlations were obtained by restricted maximum likelihood techniques. Direct responses measured in the GFW and LW yearlings were 1.7 and 1.2% per year, respectively. Correlated annual responses were 0.7% in yearling liveweight in the GFW line and 0.2% in yearling fleece weight in the LW line. Corresponding annual changes in ewe performance were 1.5% in greasy fleece weight and 0.5% in pre-mating weight in the GFW line, and 0.0 and 1.2% respectively in the LW line. Mean fibre diameter increased in yearlings and ewes of the GFW line, but did not change in the LW line. There were small but significant increases in staple length in both lines. Loose wool bulk among GFW yearlings was reduced by 0.12% per year but did not change significantly in ewes. Yearlings and ewes of the LW line both showed an increase in bulk (0.15 and 0.43%, respectively). Relative to the CO flock, CIE Y-Z among yearlings increased significantly by 1.35% per annum and 0.25% per annum in the GFW and LW flocks respectively. Among ewes it increased in the GFW line whereas the opposite occurred in the LW line. There was no significant change in percentage ewes lambing as a result of GFW or LW selection. Litter size increased and lamb survival to weaning decreased significantly, but there was a net increase per year in lambs weaned per ewe lambing (0.27% per year for the GFW line and 0.48% per year for the LW line). A95024

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Section: Traits Measured or Calculatedmentioning

confidence: 99%

Single trait selection for yearling fleece weight or liveweight in Romney sheep—correlated responses in liveweight, fleece traits, and ewe reproduction

Morris

Johnson

Sumner

et al. 1996

New Zealand Journal of Agricultural Research

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“…After depilation, the total wool sliped from each skin was weighed, a sample was scoured, and conditioned to 16% regain, the clean fleece weight was calculated, and staple length, mean fibre diameter (Lynch & Michie 1976), and loose wool bulk (Dunlop et al 1974) were measured.…”

Section: Wool Evaluationmentioning

confidence: 99%

Effects of breed and level of feeding on leather production from 18-month-old wethers

Passman¹,

Sumner²

1983

New Zealand Journal of Experimental Agriculture

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Skins were compared from 2 groups of 18-month-old Cheviot, Drysdale, and Romney wethers reared under hill country conditions, and offered initial pasture allowances per animal after weaning of either 1.5 or 3.0 kg DWday increasing progressively to 2.0 or 4.0 kg DWday at slaughter. Cheviot skins were more suited to wool-on leather production, whereas Drysdale and Romney pelts were more suited to garment leather production. Cheviot leathers were more resistant to tearing, with a stronger more extensible grain layer, more pinhole, more mottle, and less double-hiding than the other breeds. Drysdale leathers had most cockle, and Romney leathers least pinhole. Improved feeding increased weight, area, and thickness of the leather, occurrence of mottle and neck, resistance to tearing, and the strength and extensibility of the grain layer.

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“…The minimum mean fibre diameter (FD-min, /lm) was determined for each sheep from the monthly midside clippings; the projection microscope method (lWTO Test Method 8-66) was used for Group M sheep and the Fibre Fineness Distribution Analyser (Lynch & Michie 1976) calibrated with standards up to 39.6/lm was used for the other groups.…”

Section: Methodsmentioning

confidence: 99%

Relationship of staple strength and other fleece characteristics of Romney wool to fibre length after carding

Orwin¹,

Ranford²,

Geenty³

1988

New Zealand Journal of Agricultural Research

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The prediction of length-after-carding parameters (especially barbe) by several fleece characteristics was examined with wool from 58 non-pregnant Romney ewes. During the winter, the sheep were housed indoors in five groups which were fed at different levels of nutrition in an attempt to increase the variation in staple strength. However, only the group fed at the lowest level (submaintenance) showed any major effect. Considerable variation in staple strength occurred within the groups. About 61 % of the variation in barbe was explained by a regression equation based on staple length, the staple strength of midside wool, and the mean fibre diameter determined by the air-flow method. Bulk, greasy, and clean fleeceweight, and the position of break in the staple did not improve the prediction. A marginal improvement resulted when air-flow fibre diameter was replaced by minimum diameter determined from monthly midside clippings. No major variations were found in the prediction equation as a result of using different staple strength measurements or using wool from other body positions..

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An Instrument for the Rapid Automatic Measurement of Fiber Fineness Distribution

Cited by 59 publications

References 9 publications

Single trait selection for yearling fleece weight or liveweight in Romney sheep—correlated responses in liveweight, fleece traits, and ewe reproduction

Single trait selection for yearling fleece weight or liveweight in Romney sheep—correlated responses in liveweight, fleece traits, and ewe reproduction

Effects of breed and level of feeding on leather production from 18-month-old wethers

Relationship of staple strength and other fleece characteristics of Romney wool to fibre length after carding

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