Evaluation of mohair quality in Angora goats from the Northern dry lands of Tajikistan

Autores
Kosimov, F.F.; Kosimov, M.A.; Rischkowsky, Barbara; Mueller, Joaquin Pablo
Año de publicación
2013
Idioma
inglés
Tipo de recurso
artículo
Estado
versión aceptada
Descripción
Mohair quality of Angora goats in the Sogd Province of Tajikistan was assessed in spring and autumn 2007 and 2008 by inspecting and sampling a total of 797 goats of both sexes, different ages and several coat colors from 15 randomly selected flocks. Fiber fineness was assessed visually on the Bradford scale, staple length was measured with a ruler. Midside fleece samples were analyzed with an OFDA instrument to determine average fiber diameter, standard deviation, coefficient of variation (CVFD), comfort factor, fiber curvature and fiber length. On a subset of 153 goats, kemp and med fiber percentage were determined inspecting 300 fibers of each goat with a projection microscope. Mixed model procedures were used to analyze the data. Residuals of the model were used to calculate correlations. The random flock effect was significant for all traits and the fixed sex, age, and color effects were significant for most traits. In spring shearing data, fiber diameter of males was 2.7 μm coarser than females and increased with age: 27.3 μm (1 year old), 31.3 μm (2 years old), 34.6 μm (3–5 years old) and 37.0 μm (6 years and older). Mohair fiber length ranged 137.3–174.7 mm between ages. Six-month-old kid mohair (autumn shearing) was finest (24.4 μm) and shortest (95.1 mm). White mohair was approximately 3 μm coarser than brown and gray mohair. CVFD was not affected by sex and age but related to color with white mohair having a lower CVFD. Comfort factor and visual Bradford count decreased with age. Average med and kemp percentages were 0.88 and 0.34. Almost 20% of goats had 2% or more medullated fibers. The phenotypic correlation between fiber diameter and med percentage was 0.40 and between fiber diameter and kemp percentage −0.08. On average, visual Bradford count underestimated fiber diameter by about 4.1 μm. The correlation between fiber diameter and Bradford count was −0.28. Thus, visual assessment of fiber diameter is imprecise and reduction of fiber diameter through selection would therefore require analysis of fleece samples. The correlation between staple length and fiber length was 0.78. Thus, ruler determination of staple length measured on the live animals is a good estimator of fiber length measured on the fleece sample. In comparison with South African mohair, Tajik mohair is not only white, has long fibers, is rather coarse and medullated. Given the high variation between and within flocks in fiber diameter and medullation there is room for culling inferior animals and improve current mohair quality
Fil: Kosimov, F.F. Tajik Livestock Institute; Tajikistan
Fil: Kosimov, M.A. Tajik Livestock Institute; Tajikistan
Fil: Rischkowsky, Barbara. International Center for Agricultural Research in the Dry Areas; Siria
Fil: Mueller, Joaquin Pablo. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Bariloche; Argentina
Fuente
Small Ruminant Research 113 (1) : 73-79 (June 2013)
Materia
Mohair
Calidad
Fibras de Origen Animal
Caprinos
Quality
Animal Fibres
Goats
Arid Zones
Zona Arida
Tajikistan
Nivel de accesibilidad
acceso restringido
Condiciones de uso
Repositorio
INTA Digital (INTA)
Institución
Instituto Nacional de Tecnología Agropecuaria
OAI Identificador
oai:localhost:20.500.12123/1691

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oai_identifier_str oai:localhost:20.500.12123/1691
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network_name_str INTA Digital (INTA)
spelling Evaluation of mohair quality in Angora goats from the Northern dry lands of TajikistanKosimov, F.F.Kosimov, M.A.Rischkowsky, BarbaraMueller, Joaquin PabloMohairCalidadFibras de Origen AnimalCaprinosQualityAnimal FibresGoatsArid ZonesZona AridaTajikistanMohair quality of Angora goats in the Sogd Province of Tajikistan was assessed in spring and autumn 2007 and 2008 by inspecting and sampling a total of 797 goats of both sexes, different ages and several coat colors from 15 randomly selected flocks. Fiber fineness was assessed visually on the Bradford scale, staple length was measured with a ruler. Midside fleece samples were analyzed with an OFDA instrument to determine average fiber diameter, standard deviation, coefficient of variation (CVFD), comfort factor, fiber curvature and fiber length. On a subset of 153 goats, kemp and med fiber percentage were determined inspecting 300 fibers of each goat with a projection microscope. Mixed model procedures were used to analyze the data. Residuals of the model were used to calculate correlations. The random flock effect was significant for all traits and the fixed sex, age, and color effects were significant for most traits. In spring shearing data, fiber diameter of males was 2.7 μm coarser than females and increased with age: 27.3 μm (1 year old), 31.3 μm (2 years old), 34.6 μm (3–5 years old) and 37.0 μm (6 years and older). Mohair fiber length ranged 137.3–174.7 mm between ages. Six-month-old kid mohair (autumn shearing) was finest (24.4 μm) and shortest (95.1 mm). White mohair was approximately 3 μm coarser than brown and gray mohair. CVFD was not affected by sex and age but related to color with white mohair having a lower CVFD. Comfort factor and visual Bradford count decreased with age. Average med and kemp percentages were 0.88 and 0.34. Almost 20% of goats had 2% or more medullated fibers. The phenotypic correlation between fiber diameter and med percentage was 0.40 and between fiber diameter and kemp percentage −0.08. On average, visual Bradford count underestimated fiber diameter by about 4.1 μm. The correlation between fiber diameter and Bradford count was −0.28. Thus, visual assessment of fiber diameter is imprecise and reduction of fiber diameter through selection would therefore require analysis of fleece samples. The correlation between staple length and fiber length was 0.78. Thus, ruler determination of staple length measured on the live animals is a good estimator of fiber length measured on the fleece sample. In comparison with South African mohair, Tajik mohair is not only white, has long fibers, is rather coarse and medullated. Given the high variation between and within flocks in fiber diameter and medullation there is room for culling inferior animals and improve current mohair qualityFil: Kosimov, F.F. Tajik Livestock Institute; TajikistanFil: Kosimov, M.A. Tajik Livestock Institute; TajikistanFil: Rischkowsky, Barbara. International Center for Agricultural Research in the Dry Areas; SiriaFil: Mueller, Joaquin Pablo. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Bariloche; Argentina2017-11-07T12:45:09Z2017-11-07T12:45:09Z2013-06info:eu-repo/semantics/articleinfo:eu-repo/semantics/acceptedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfhttp://hdl.handle.net/20.500.12123/1691https://www.sciencedirect.com/science/article/pii/S09214488130003450921-4488https://doi.org/10.1016/j.smallrumres.2013.02.002Small Ruminant Research 113 (1) : 73-79 (June 2013)reponame:INTA Digital (INTA)instname:Instituto Nacional de Tecnología Agropecuariaenginfo:eu-repo/semantics/restrictedAccess2025-09-04T09:47:07Zoai:localhost:20.500.12123/1691instacron:INTAInstitucionalhttp://repositorio.inta.gob.ar/Organismo científico-tecnológicoNo correspondehttp://repositorio.inta.gob.ar/oai/requesttripaldi.nicolas@inta.gob.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:l2025-09-04 09:47:08.086INTA Digital (INTA) - Instituto Nacional de Tecnología Agropecuariafalse
dc.title.none.fl_str_mv Evaluation of mohair quality in Angora goats from the Northern dry lands of Tajikistan
title Evaluation of mohair quality in Angora goats from the Northern dry lands of Tajikistan
spellingShingle Evaluation of mohair quality in Angora goats from the Northern dry lands of Tajikistan
Kosimov, F.F.
Mohair
Calidad
Fibras de Origen Animal
Caprinos
Quality
Animal Fibres
Goats
Arid Zones
Zona Arida
Tajikistan
title_short Evaluation of mohair quality in Angora goats from the Northern dry lands of Tajikistan
title_full Evaluation of mohair quality in Angora goats from the Northern dry lands of Tajikistan
title_fullStr Evaluation of mohair quality in Angora goats from the Northern dry lands of Tajikistan
title_full_unstemmed Evaluation of mohair quality in Angora goats from the Northern dry lands of Tajikistan
title_sort Evaluation of mohair quality in Angora goats from the Northern dry lands of Tajikistan
dc.creator.none.fl_str_mv Kosimov, F.F.
Kosimov, M.A.
Rischkowsky, Barbara
Mueller, Joaquin Pablo
author Kosimov, F.F.
author_facet Kosimov, F.F.
Kosimov, M.A.
Rischkowsky, Barbara
Mueller, Joaquin Pablo
author_role author
author2 Kosimov, M.A.
Rischkowsky, Barbara
Mueller, Joaquin Pablo
author2_role author
author
author
dc.subject.none.fl_str_mv Mohair
Calidad
Fibras de Origen Animal
Caprinos
Quality
Animal Fibres
Goats
Arid Zones
Zona Arida
Tajikistan
topic Mohair
Calidad
Fibras de Origen Animal
Caprinos
Quality
Animal Fibres
Goats
Arid Zones
Zona Arida
Tajikistan
dc.description.none.fl_txt_mv Mohair quality of Angora goats in the Sogd Province of Tajikistan was assessed in spring and autumn 2007 and 2008 by inspecting and sampling a total of 797 goats of both sexes, different ages and several coat colors from 15 randomly selected flocks. Fiber fineness was assessed visually on the Bradford scale, staple length was measured with a ruler. Midside fleece samples were analyzed with an OFDA instrument to determine average fiber diameter, standard deviation, coefficient of variation (CVFD), comfort factor, fiber curvature and fiber length. On a subset of 153 goats, kemp and med fiber percentage were determined inspecting 300 fibers of each goat with a projection microscope. Mixed model procedures were used to analyze the data. Residuals of the model were used to calculate correlations. The random flock effect was significant for all traits and the fixed sex, age, and color effects were significant for most traits. In spring shearing data, fiber diameter of males was 2.7 μm coarser than females and increased with age: 27.3 μm (1 year old), 31.3 μm (2 years old), 34.6 μm (3–5 years old) and 37.0 μm (6 years and older). Mohair fiber length ranged 137.3–174.7 mm between ages. Six-month-old kid mohair (autumn shearing) was finest (24.4 μm) and shortest (95.1 mm). White mohair was approximately 3 μm coarser than brown and gray mohair. CVFD was not affected by sex and age but related to color with white mohair having a lower CVFD. Comfort factor and visual Bradford count decreased with age. Average med and kemp percentages were 0.88 and 0.34. Almost 20% of goats had 2% or more medullated fibers. The phenotypic correlation between fiber diameter and med percentage was 0.40 and between fiber diameter and kemp percentage −0.08. On average, visual Bradford count underestimated fiber diameter by about 4.1 μm. The correlation between fiber diameter and Bradford count was −0.28. Thus, visual assessment of fiber diameter is imprecise and reduction of fiber diameter through selection would therefore require analysis of fleece samples. The correlation between staple length and fiber length was 0.78. Thus, ruler determination of staple length measured on the live animals is a good estimator of fiber length measured on the fleece sample. In comparison with South African mohair, Tajik mohair is not only white, has long fibers, is rather coarse and medullated. Given the high variation between and within flocks in fiber diameter and medullation there is room for culling inferior animals and improve current mohair quality
Fil: Kosimov, F.F. Tajik Livestock Institute; Tajikistan
Fil: Kosimov, M.A. Tajik Livestock Institute; Tajikistan
Fil: Rischkowsky, Barbara. International Center for Agricultural Research in the Dry Areas; Siria
Fil: Mueller, Joaquin Pablo. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Bariloche; Argentina
description Mohair quality of Angora goats in the Sogd Province of Tajikistan was assessed in spring and autumn 2007 and 2008 by inspecting and sampling a total of 797 goats of both sexes, different ages and several coat colors from 15 randomly selected flocks. Fiber fineness was assessed visually on the Bradford scale, staple length was measured with a ruler. Midside fleece samples were analyzed with an OFDA instrument to determine average fiber diameter, standard deviation, coefficient of variation (CVFD), comfort factor, fiber curvature and fiber length. On a subset of 153 goats, kemp and med fiber percentage were determined inspecting 300 fibers of each goat with a projection microscope. Mixed model procedures were used to analyze the data. Residuals of the model were used to calculate correlations. The random flock effect was significant for all traits and the fixed sex, age, and color effects were significant for most traits. In spring shearing data, fiber diameter of males was 2.7 μm coarser than females and increased with age: 27.3 μm (1 year old), 31.3 μm (2 years old), 34.6 μm (3–5 years old) and 37.0 μm (6 years and older). Mohair fiber length ranged 137.3–174.7 mm between ages. Six-month-old kid mohair (autumn shearing) was finest (24.4 μm) and shortest (95.1 mm). White mohair was approximately 3 μm coarser than brown and gray mohair. CVFD was not affected by sex and age but related to color with white mohair having a lower CVFD. Comfort factor and visual Bradford count decreased with age. Average med and kemp percentages were 0.88 and 0.34. Almost 20% of goats had 2% or more medullated fibers. The phenotypic correlation between fiber diameter and med percentage was 0.40 and between fiber diameter and kemp percentage −0.08. On average, visual Bradford count underestimated fiber diameter by about 4.1 μm. The correlation between fiber diameter and Bradford count was −0.28. Thus, visual assessment of fiber diameter is imprecise and reduction of fiber diameter through selection would therefore require analysis of fleece samples. The correlation between staple length and fiber length was 0.78. Thus, ruler determination of staple length measured on the live animals is a good estimator of fiber length measured on the fleece sample. In comparison with South African mohair, Tajik mohair is not only white, has long fibers, is rather coarse and medullated. Given the high variation between and within flocks in fiber diameter and medullation there is room for culling inferior animals and improve current mohair quality
publishDate 2013
dc.date.none.fl_str_mv 2013-06
2017-11-07T12:45:09Z
2017-11-07T12:45:09Z
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/acceptedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str acceptedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/20.500.12123/1691
https://www.sciencedirect.com/science/article/pii/S0921448813000345
0921-4488
https://doi.org/10.1016/j.smallrumres.2013.02.002
url http://hdl.handle.net/20.500.12123/1691
https://www.sciencedirect.com/science/article/pii/S0921448813000345
https://doi.org/10.1016/j.smallrumres.2013.02.002
identifier_str_mv 0921-4488
dc.language.none.fl_str_mv eng
language eng
dc.rights.none.fl_str_mv info:eu-repo/semantics/restrictedAccess
eu_rights_str_mv restrictedAccess
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv Small Ruminant Research 113 (1) : 73-79 (June 2013)
reponame:INTA Digital (INTA)
instname:Instituto Nacional de Tecnología Agropecuaria
reponame_str INTA Digital (INTA)
collection INTA Digital (INTA)
instname_str Instituto Nacional de Tecnología Agropecuaria
repository.name.fl_str_mv INTA Digital (INTA) - Instituto Nacional de Tecnología Agropecuaria
repository.mail.fl_str_mv tripaldi.nicolas@inta.gob.ar
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