Assessment of milk production in Assaf ewes born as twin based on correspondence analyses and mixed model

The aim of this study was to determine whether the presence and number of male and female twins affected the future milk yields of female ewes in adulthood. The study was based on 10,049 milk production records from 12 dairy sheep farms in Spain. Total milk yield (TMY) was categorized as either Low...

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Autores: Contreras Solís, Ignacio, Abecia, José Alfonso, Palacios, C.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2026
País:España
Institución:Universidad Pública de Navarra
Repositorio:Academica-e. Repositorio Institucional de la Universidad Pública de Navarra
OAI Identifier:oai:dnet:academicae__::f3d95dfb456cddc44e448048a9178592
Acceso en línea:https://doi.org/10.1016/j.smallrumres.2026.107767
https://hdl.handle.net/2454/56761
Access Level:acceso abierto
Palabra clave:Litter size
Sex of twins
Milk yield
Dairy sheep
Correspondence analyses
Mixed model
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spelling Assessment of milk production in Assaf ewes born as twin based on correspondence analyses and mixed modelContreras Solís, IgnacioAbecia, José AlfonsoPalacios, C.Litter sizeSex of twinsMilk yieldDairy sheepCorrespondence analysesMixed modelThe aim of this study was to determine whether the presence and number of male and female twins affected the future milk yields of female ewes in adulthood. The study was based on 10,049 milk production records from 12 dairy sheep farms in Spain. Total milk yield (TMY) was categorized as either Low or High, and daily milk yield (DMY) was categorized as either Low/1, Intermediate-low/2, Intermediate-high/3, or High/4. Twins were categorized as follows: (1) ewes born without a twin (0 T), (2) ewes born with at least one female twin (at least 1FT: 1 and 2 sisters), (3) at least one male twin (at least 1MT: 1 and 2 brothers), or (4) with one male and one female twin (1MT+1FT: one brother and sister). Correspondence analyses indicated that ewes in the 0 T group were associated with low TMY and DMY, and twin births (at least 1MT and 1FT groups) were associated with 2–4TMY levels, and 3–4DMY levels. Mixed-effect-model indicated that ewes in the at least 1MT group had a positive effect on TMY (P < 0.05) and DMY (P < 0.01), than did ewes in the 0 T group. In summary, litter size and litter sex ratio in intrauterine life had a positive effect on milk production in ewes in adulthood. This effect is positively evidenced in ewes born with at least one-male-twins. This information might be useful in identifying ways to improve the economic-productive efficiency of sheep dairy systems.ElsevierAgronomía, Biotecnología y AlimentaciónAgronomia, Bioteknologia eta Elikadura2026info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://doi.org/10.1016/j.smallrumres.2026.107767https://hdl.handle.net/2454/56761reponame:Academica-e. Repositorio Institucional de la Universidad Pública de Navarrainstname:Universidad Pública de NavarraInglés© 2026 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license.https://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccessoai:dnet:academicae__::f3d95dfb456cddc44e448048a91785922026-06-17T12:41:47Z
dc.title.none.fl_str_mv Assessment of milk production in Assaf ewes born as twin based on correspondence analyses and mixed model
title Assessment of milk production in Assaf ewes born as twin based on correspondence analyses and mixed model
spellingShingle Assessment of milk production in Assaf ewes born as twin based on correspondence analyses and mixed model
Contreras Solís, Ignacio
Litter size
Sex of twins
Milk yield
Dairy sheep
Correspondence analyses
Mixed model
title_short Assessment of milk production in Assaf ewes born as twin based on correspondence analyses and mixed model
title_full Assessment of milk production in Assaf ewes born as twin based on correspondence analyses and mixed model
title_fullStr Assessment of milk production in Assaf ewes born as twin based on correspondence analyses and mixed model
title_full_unstemmed Assessment of milk production in Assaf ewes born as twin based on correspondence analyses and mixed model
title_sort Assessment of milk production in Assaf ewes born as twin based on correspondence analyses and mixed model
dc.creator.none.fl_str_mv Contreras Solís, Ignacio
Abecia, José Alfonso
Palacios, C.
author Contreras Solís, Ignacio
author_facet Contreras Solís, Ignacio
Abecia, José Alfonso
Palacios, C.
author_role author
author2 Abecia, José Alfonso
Palacios, C.
author2_role author
author
dc.contributor.none.fl_str_mv Agronomía, Biotecnología y Alimentación
Agronomia, Bioteknologia eta Elikadura
dc.subject.none.fl_str_mv Litter size
Sex of twins
Milk yield
Dairy sheep
Correspondence analyses
Mixed model
topic Litter size
Sex of twins
Milk yield
Dairy sheep
Correspondence analyses
Mixed model
description The aim of this study was to determine whether the presence and number of male and female twins affected the future milk yields of female ewes in adulthood. The study was based on 10,049 milk production records from 12 dairy sheep farms in Spain. Total milk yield (TMY) was categorized as either Low or High, and daily milk yield (DMY) was categorized as either Low/1, Intermediate-low/2, Intermediate-high/3, or High/4. Twins were categorized as follows: (1) ewes born without a twin (0 T), (2) ewes born with at least one female twin (at least 1FT: 1 and 2 sisters), (3) at least one male twin (at least 1MT: 1 and 2 brothers), or (4) with one male and one female twin (1MT+1FT: one brother and sister). Correspondence analyses indicated that ewes in the 0 T group were associated with low TMY and DMY, and twin births (at least 1MT and 1FT groups) were associated with 2–4TMY levels, and 3–4DMY levels. Mixed-effect-model indicated that ewes in the at least 1MT group had a positive effect on TMY (P < 0.05) and DMY (P < 0.01), than did ewes in the 0 T group. In summary, litter size and litter sex ratio in intrauterine life had a positive effect on milk production in ewes in adulthood. This effect is positively evidenced in ewes born with at least one-male-twins. This information might be useful in identifying ways to improve the economic-productive efficiency of sheep dairy systems.
publishDate 2026
dc.date.none.fl_str_mv 2026
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv https://doi.org/10.1016/j.smallrumres.2026.107767
https://hdl.handle.net/2454/56761
url https://doi.org/10.1016/j.smallrumres.2026.107767
https://hdl.handle.net/2454/56761
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.rights.none.fl_str_mv https://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-nd/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:Academica-e. Repositorio Institucional de la Universidad Pública de Navarra
instname:Universidad Pública de Navarra
instname_str Universidad Pública de Navarra
reponame_str Academica-e. Repositorio Institucional de la Universidad Pública de Navarra
collection Academica-e. Repositorio Institucional de la Universidad Pública de Navarra
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