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Lifetime and fleece quality traits associated with the occurrence of entangled mohair staples

McGregor,BA and Butler,KL 2014, Lifetime and fleece quality traits associated with the occurrence of entangled mohair staples, Small Ruminant Research, vol. 116, no. 2-3, pp. 165-175, doi: 10.1016/j.smallrumres.2013.11.003.

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Title Lifetime and fleece quality traits associated with the occurrence of entangled mohair staples
Author(s) McGregor,BAORCID iD for McGregor,BA orcid.org/0000-0002-4574-4236
Butler,KL
Journal name Small Ruminant Research
Volume number 116
Issue number 2-3
Start page 165
End page 175
Total pages 11
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2014-02
ISSN 0921-4488
Keyword(s) Age
Curvature
Genetics
Quality
Washing yield
ANGORA-GOATS
ALLOMETRIC RELATIONSHIP
SUBJECTIVE ATTRIBUTES
FREE LIVEWEIGHT
GROWTH
FIBER
Summary Staple entanglement in mohair fleeces occurs when adhesions form between longer and faster growing fibres and shorter and slower growing fibres. This results in accentuated crimp of the longer fibres and an "apparently" reduced staple length. The appearance in the fleece of Angora goats of staple entanglements can lead to the downgrading of the mohair to poorer style and shorter length grades, resulting in up to 60% price reductions. This study examined how staple entanglement score (SES) is related to lifetime factors of Angora goats, and how this relationship can be explained by variations in animal size and fleece attributes. SES was scored using a five-point scale: 5, long free fibres easily separated as no adhesions; 4, some adhesions between fibres; 3, some effort to separate fibres as many adhesions; 2, many adhesions, staple fibres entangled, shortening of staple; 1, very entangled and shortened staple. Measurements were made over 9 shearing periods on a population of Angora castrated males (wethers) goats representing the current range and diversity of genetic origins in Australia, including South African, Texan and interbred admixtures of these and Australian sources. Data on genetic origin, sire, dam, date of birth, dam age, birth weight, birth parity, weaning weight, live weight, fleece growth and fleece attributes were recorded. Two restricted maximum likelihood (REML) models were developed to relate SES with age, animal lifetime factors, fleece quality attributes and live weight. One model allowed fleece quality and live weight traits in the model and the other excluded these traits. Staple entanglement was almost eliminated in mohair harvested from goats shorn every 3. months but was common in mohair from goats shorn twice or once per year. SES was less in goats of Texan genetic background, and was generally less in winter grown mohair. SES was higher for mohair with low fibre curvature (FC, 10°/mm) and a high clean washing yield (CWY, 90%) compared with mohair with low FC and lower CWY (80%), and compared with all mohair with high FC (18°/mm). The response of SES to shearing regime, genetic background, shearing season, age of goat and a response to dam age were almost identical whether or not an adjustment was made for CWY and FC. There was a moderate amount of variability due to sires and individuals. We can conclude that a large part of these effects observed, namely breed, dam age, sire, and a component of the FC and CWY effects, are genetic. Mohair producers can manage the genetic effects by careful selection of sires, especially avoiding those with low CWY or high FC, and avoiding sires with higher levels of staple entanglement or that have produced progeny with higher levels of staple entanglement. Also, unidentified environmental effects are affecting staple entanglement, although a lack of a live weight change effect on entanglement indicates that this effect might not be due to nutrition. © 2013 Elsevier B.V.
Language eng
DOI 10.1016/j.smallrumres.2013.11.003
Field of Research 070202 Animal Growth and Development
070201 Animal Breeding
Socio Economic Objective 830304 Goats
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2014, Elsevier
Persistent URL http://hdl.handle.net/10536/DRO/DU:30069690

Document type: Journal Article
Collection: Institute for Frontier Materials
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