Brain size is reduced by selection for tameness in Red Junglefowl– correlated effects in vital organs

Abstract During domestication animals have undergone changes in size of brain and other vital organs. We hypothesize that this could be a correlated effect to increased tameness. Red Junglefowl (ancestors of domestic chickens) were selected for divergent levels of fear of humans for five generations...

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Autores principales:	Beatrix Agnvall, Johan Bélteky, Per Jensen
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/e51c4e8ad9bb4f71a21ce5b39910fecb
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spelling	oai:doaj.org-article:e51c4e8ad9bb4f71a21ce5b39910fecb2021-12-02T12:32:51ZBrain size is reduced by selection for tameness in Red Junglefowl– correlated effects in vital organs10.1038/s41598-017-03236-42045-2322https://doaj.org/article/e51c4e8ad9bb4f71a21ce5b39910fecb2017-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-03236-4https://doaj.org/toc/2045-2322Abstract During domestication animals have undergone changes in size of brain and other vital organs. We hypothesize that this could be a correlated effect to increased tameness. Red Junglefowl (ancestors of domestic chickens) were selected for divergent levels of fear of humans for five generations. The parental (P0) and the fifth selected generation (S5) were culled when 48–54 weeks old and the brains were weighed before being divided into telencephalon, cerebellum, mid brain and optic lobes. Each single brain part as well as the liver, spleen, heart and testicles were also weighed. Brains of S5 birds with high fear scores (S5 high) were heavier both in absolute terms and when corrected for body weight. The relative weight of telencephalon (% of brain weight) was significantly higher in S5 high and relative weight of cerebellum was lower. Heart, liver, testes and spleen were all relatively heavier (% of body weight) in S5 high. Hence, selection for tameness has changed the size of the brain and other vital organs in this population and may have driven the domesticated phenotype as a correlated response.Beatrix AgnvallJohan BéltekyPer JensenNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-7 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Beatrix Agnvall Johan Bélteky Per Jensen Brain size is reduced by selection for tameness in Red Junglefowl– correlated effects in vital organs
description	Abstract During domestication animals have undergone changes in size of brain and other vital organs. We hypothesize that this could be a correlated effect to increased tameness. Red Junglefowl (ancestors of domestic chickens) were selected for divergent levels of fear of humans for five generations. The parental (P0) and the fifth selected generation (S5) were culled when 48–54 weeks old and the brains were weighed before being divided into telencephalon, cerebellum, mid brain and optic lobes. Each single brain part as well as the liver, spleen, heart and testicles were also weighed. Brains of S5 birds with high fear scores (S5 high) were heavier both in absolute terms and when corrected for body weight. The relative weight of telencephalon (% of brain weight) was significantly higher in S5 high and relative weight of cerebellum was lower. Heart, liver, testes and spleen were all relatively heavier (% of body weight) in S5 high. Hence, selection for tameness has changed the size of the brain and other vital organs in this population and may have driven the domesticated phenotype as a correlated response.
format	article
author	Beatrix Agnvall Johan Bélteky Per Jensen
author_facet	Beatrix Agnvall Johan Bélteky Per Jensen
author_sort	Beatrix Agnvall
title	Brain size is reduced by selection for tameness in Red Junglefowl– correlated effects in vital organs
title_short	Brain size is reduced by selection for tameness in Red Junglefowl– correlated effects in vital organs
title_full	Brain size is reduced by selection for tameness in Red Junglefowl– correlated effects in vital organs
title_fullStr	Brain size is reduced by selection for tameness in Red Junglefowl– correlated effects in vital organs
title_full_unstemmed	Brain size is reduced by selection for tameness in Red Junglefowl– correlated effects in vital organs
title_sort	brain size is reduced by selection for tameness in red junglefowl– correlated effects in vital organs
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/e51c4e8ad9bb4f71a21ce5b39910fecb
work_keys_str_mv	AT beatrixagnvall brainsizeisreducedbyselectionfortamenessinredjunglefowlcorrelatedeffectsinvitalorgans AT johanbelteky brainsizeisreducedbyselectionfortamenessinredjunglefowlcorrelatedeffectsinvitalorgans AT perjensen brainsizeisreducedbyselectionfortamenessinredjunglefowlcorrelatedeffectsinvitalorgans
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Brain size is reduced by selection for tameness in Red Junglefowl– correlated effects in vital organs

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