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Responses of pigs divergently selected for cortisol level or feed efficiency to a challenge diet during growth

Authors :
Hélène Gilbert
Elena Terenina
Julien Ruesche
Laure Gress
Yvon Billon
Pierre Mormede
Catherine Larzul
Génétique Physiologie et Systèmes d'Elevage (GenPhySE )
Institut National de la Recherche Agronomique (INRA)-Ecole Nationale Vétérinaire de Toulouse (ENVT)
Institut National Polytechnique (Toulouse) (Toulouse INP)
Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National Polytechnique (Toulouse) (Toulouse INP)
Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-École nationale supérieure agronomique de Toulouse [ENSAT]
UE 1372 Génétique, Expérimentation et Système Innovants
Institut National de la Recherche Agronomique (INRA)-Génétique animale (G.A.)-Physiologie Animale et Systèmes d'Elevage (PHASE)
Institut National de la Recherche Agronomique (INRA)-Génétique, Expérimentation et Système Innovants (GenESI)
École nationale supérieure agronomique de Toulouse [ENSAT]-Institut National de la Recherche Agronomique (INRA)-Ecole Nationale Vétérinaire de Toulouse (ENVT)
Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées
Génétique, Expérimentation et Système Innovants (GenESI)
Institut National de la Recherche Agronomique (INRA)
Source :
Proceedings of the 11th World Congress on Genetics Applied to Livestock Production, 11. World Congress on Genetics Applied to Livestock Production (WCGALP), 11. World Congress on Genetics Applied to Livestock Production (WCGALP), Feb 2018, Auckland, New Zealand. 1130 p, Proceedings of the 11th World Congress on Genetics Applied to Livestock Production. 2018; 11. World Congress on Genetics Applied to Livestock Production (WCGALP), Auckland, NZL, 2018-02-11-2018-02-16, p.219, HAL, www.wcgalp.com
Publication Year :
2018
Publisher :
HAL CCSD, 2018.

Abstract

Selection for feed efficiency is questioned as reducing the ability of farm animals to face stress and overcome challenges. The hypothalamic-pituitary-adrenocortical (HPA) axis activity, measured by the cortisol level in plasma after ACTH injection, has been proposed as an indicator of robustness. The objectives of this study were to evaluate 1. if a modified cortisol level in pigs alters their feed efficiency and their production performance, 2. if alternative dietary resources would affect these responses. Parallel trials including divergent lines for plasma cortisol 1 hour after ACTH injection and divergent lines for residual feed intake (RFI) were run during growth with a conventional diet and a diet with high fibres, low energy and low protein content. Selection for higher or lower plasma cortisol levels after stimulation of the adrenal gland did not impact growth and feed intake traits, but it had a significant impact on body composition and carcass yield, with improved composition in the high cortisol animals. The two lines had similar responses to an alternative diet, with decreased growth rate and feed intake, and increased feed conversion ratio. On the other hand, lines selected for divergent RFI had different responses to the alternative diet, the more efficient line having a more reduced growth rate with the diet with lower energy and AA contents. However, in terms of FCR it remained more efficient. The initial hypothesis of decreased efficiency associated to increased cortisol was not validated.

Details

Language :
English
Database :
OpenAIRE
Journal :
Proceedings of the 11th World Congress on Genetics Applied to Livestock Production, 11. World Congress on Genetics Applied to Livestock Production (WCGALP), 11. World Congress on Genetics Applied to Livestock Production (WCGALP), Feb 2018, Auckland, New Zealand. 1130 p, Proceedings of the 11th World Congress on Genetics Applied to Livestock Production. 2018; 11. World Congress on Genetics Applied to Livestock Production (WCGALP), Auckland, NZL, 2018-02-11-2018-02-16, p.219, HAL, www.wcgalp.com
Accession number :
edsair.dedup.wf.001..6d47ed3a89ba037008a5c4348612f129