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Réponses à la sélection pour deux critères d'efficacité alimentaire chez le lapin . 1. Croissance, ingéré et efficacité alimentaire

Abstract : Genetic improvement of feed efficiency using two alternate traits compared to feed to gain ratio (FCR) were studied in the growing rabbit: Residual Feed Intake (RFI), to select low ad libitum feed intake independently from production level (ConsoRésiduelle line), and Average Daily Gain (ADGR) under restricted feeding (GMQrestreint line) (80% of ad libitum), to select high ADG under limited fixed feed intake. Responses to selection for the two criteria were similar in the two lines (-0.34 genetic standard deviations (σa) per generation for RFI, +0.29 σa per generation for GMQR line). Responses to selection were -0.30 σa per generation on FCR in both lines. Responses to selection were null on ADG and limited on BW63 in the ConsoRésiduelle line, whereas they were highly significant in the GMQrestreint line. To further examine responses to selection, in generation 9 a comparison of the two selected lines with the G0 control population (using frozen embryos) under ad libitum and restricted feeding was applied to 30 individuals per line and feeding level combination. As a result, both selected lines had a similar improved FCR (2.62±0.02) compared to the G0 line (2.82±0.02), but with a lower feed intake. In return, the GMQrestreint line showed the highest growth. Under restricted feeding, the two selected lines showed a higher daily gain than G0.
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  • HAL Id : hal-02742139, version 1
  • PRODINRA : 338361

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Herve Garreau, Hélène Gilbert, Caroline Molette, Catherine Larzul, Elodie Balmisse, et al.. Réponses à la sélection pour deux critères d'efficacité alimentaire chez le lapin . 1. Croissance, ingéré et efficacité alimentaire. 16. Journées de la Recherche Cunicole, Nov 2015, Le Mans, France. 264 p. ⟨hal-02742139⟩

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