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Efficacité alimentaire et activité de l’axe corticotrope : comparaison des caractères de production dans des lignées divergentes soumises à un aliment fibreux

Abstract : An unfavourable relationship between responses to stress and feed efficiency has been proposed. Parallel trials were run, including divergent lines for residual feed intake and divergent lines for plasma cortisol response 1 h after ACTH injection. At 6 weeks of age, 48 pigs from each of the four lines were injected with ACTH. Plasma cortisol was measured before injection, and 1 h and 4 h later. Growth rate, feed intake, feed efficiency, body composition and meat quality were measured during the growing-finishing period on the same pigs fed either a conventional diet (9.7 MJ net energy (NE) and 160 g crude protein/kg) or a diet with an increased proportion of dietary fibres to dilute NE and digestible amino acids (AA) by 10%. Comparison of the lines selected for feed efficiency showed that the response to ACTH was slightly stronger, and lasted longer, in the more efficient line (P < 0.05). During the feed challenge, the growth rate of the most efficient line decreased more with the diet with lower NE and AA contents than that of the less efficient line (P < 0.06). However, in terms of feed efficiency, the more efficient line remained more efficient. On the other hand, comparison of the 'response to ACTH' lines showed no difference for growth and feed intake during the growth period, but a higher carcass yield and a leaner body composition of animals with higher plasma cortisol after ACTH injection. Thus, the initial hypothesis of a negative association between feed efficiency and the HPA axis activity is not supported.
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Submitted on : Tuesday, June 2, 2020 - 7:09:41 PM
Last modification on : Friday, November 5, 2021 - 2:38:21 PM

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  • HAL Id : hal-02737375, version 1
  • PRODINRA : 461587

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Hélène Gilbert, Elena Terenina, Julien Ruesche, Laure Gress, Yvon Billon, et al.. Efficacité alimentaire et activité de l’axe corticotrope : comparaison des caractères de production dans des lignées divergentes soumises à un aliment fibreux. 51. Journées de la Recherche Porcine, Feb 2019, Paris, France. ⟨hal-02737375⟩

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