Social status and previous experience in the group as predictors of welfare of sows housed in large semi-static groups.

Mixing gestating sows implies hierarchy formation and has detrimental consequences on welfare. The effects of social stress on the most vulnerable individuals may be underestimated and it is therefore important to evaluate welfare between individuals within groups. This study aimed at investigating...

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Autores principales:	Sophie Brajon, Jamie Ahloy-Dallaire, Nicolas Devillers, Frédéric Guay
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/d29d529cbf0b4bbe999152cbefa3291c
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spelling	oai:doaj.org-article:d29d529cbf0b4bbe999152cbefa3291c2021-12-02T20:03:54ZSocial status and previous experience in the group as predictors of welfare of sows housed in large semi-static groups.1932-620310.1371/journal.pone.0244704https://doaj.org/article/d29d529cbf0b4bbe999152cbefa3291c2021-01-01T00:00:00Zhttps://doi.org/10.1371/journal.pone.0244704https://doaj.org/toc/1932-6203Mixing gestating sows implies hierarchy formation and has detrimental consequences on welfare. The effects of social stress on the most vulnerable individuals may be underestimated and it is therefore important to evaluate welfare between individuals within groups. This study aimed at investigating the impact of social status and previous experience in the group on well-being of sows housed in large semi-static groups. We assessed aggression (d0 (mixing), d2, d27, d29), body lesions (d1, d26, d84) and feeding order on 20 groups of 46-91 animals. Social status was based on the proportion of fights won during a 6-hr observation period between d0 and d2. Dominants (29%) were those who won more fights than they lost, Subdominants (25%) won fewer fights than they lost, Losers (23%) never won any fight in which they were involved while Avoiders (23%) were never involved in fights. Resident sows (70%) were already present in the group in the previous gestation while New sows (30%) were newly introduced at mixing. Subdominants and Dominants were highly involved in fights around mixing but this was more detrimental for Subdominants than Dominants, Losers and Avoiders since they had the highest body lesion scores at mixing. Avoiders received less non-reciprocal agonistic acts than Losers on d2 (P = 0.0001) and had the lowest body lesion scores after mixing. However, Avoiders and Losers were more at risk in the long-term since they had the highest body lesions scores at d26 and d84. They were followed by Subdominants and then Dominants. New sows fought more (P<0.0001), tended to be involved in longer fights (P = 0.075) around mixing and had more body lesions throughout gestation than Resident sows. Feeding order from one-month post-mixing was influenced both by the previous experience in the group and social status (P<0.0001). New sows, especially with a low social status, are more vulnerable throughout gestation and could serve as indicators of non-optimal conditions.Sophie BrajonJamie Ahloy-DallaireNicolas DevillersFrédéric GuayPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 16, Iss 6, p e0244704 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Sophie Brajon Jamie Ahloy-Dallaire Nicolas Devillers Frédéric Guay Social status and previous experience in the group as predictors of welfare of sows housed in large semi-static groups.
description	Mixing gestating sows implies hierarchy formation and has detrimental consequences on welfare. The effects of social stress on the most vulnerable individuals may be underestimated and it is therefore important to evaluate welfare between individuals within groups. This study aimed at investigating the impact of social status and previous experience in the group on well-being of sows housed in large semi-static groups. We assessed aggression (d0 (mixing), d2, d27, d29), body lesions (d1, d26, d84) and feeding order on 20 groups of 46-91 animals. Social status was based on the proportion of fights won during a 6-hr observation period between d0 and d2. Dominants (29%) were those who won more fights than they lost, Subdominants (25%) won fewer fights than they lost, Losers (23%) never won any fight in which they were involved while Avoiders (23%) were never involved in fights. Resident sows (70%) were already present in the group in the previous gestation while New sows (30%) were newly introduced at mixing. Subdominants and Dominants were highly involved in fights around mixing but this was more detrimental for Subdominants than Dominants, Losers and Avoiders since they had the highest body lesion scores at mixing. Avoiders received less non-reciprocal agonistic acts than Losers on d2 (P = 0.0001) and had the lowest body lesion scores after mixing. However, Avoiders and Losers were more at risk in the long-term since they had the highest body lesions scores at d26 and d84. They were followed by Subdominants and then Dominants. New sows fought more (P<0.0001), tended to be involved in longer fights (P = 0.075) around mixing and had more body lesions throughout gestation than Resident sows. Feeding order from one-month post-mixing was influenced both by the previous experience in the group and social status (P<0.0001). New sows, especially with a low social status, are more vulnerable throughout gestation and could serve as indicators of non-optimal conditions.
format	article
author	Sophie Brajon Jamie Ahloy-Dallaire Nicolas Devillers Frédéric Guay
author_facet	Sophie Brajon Jamie Ahloy-Dallaire Nicolas Devillers Frédéric Guay
author_sort	Sophie Brajon
title	Social status and previous experience in the group as predictors of welfare of sows housed in large semi-static groups.
title_short	Social status and previous experience in the group as predictors of welfare of sows housed in large semi-static groups.
title_full	Social status and previous experience in the group as predictors of welfare of sows housed in large semi-static groups.
title_fullStr	Social status and previous experience in the group as predictors of welfare of sows housed in large semi-static groups.
title_full_unstemmed	Social status and previous experience in the group as predictors of welfare of sows housed in large semi-static groups.
title_sort	social status and previous experience in the group as predictors of welfare of sows housed in large semi-static groups.
publisher	Public Library of Science (PLoS)
publishDate	2021
url	https://doaj.org/article/d29d529cbf0b4bbe999152cbefa3291c
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Social status and previous experience in the group as predictors of welfare of sows housed in large semi-static groups.

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