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Quantification of the feed intake response of growing pigs to perturbations – A modelling approach

Abstract : Robustness, however, is a complex trait and not measurable directly. The aim of this PhD thesis was to develop a method to quantify elements of robustness in growing pigs. A mathematical model was developed to detect perturbations on feed intake and to quantify the response of pigs to perturbations in terms of resistance and resilience. The model estimated a targeted trajectory of cumulative feed intake which is hypothesized as the desired feed intake in non-perturbed condition. Consequences of perturbations can be detected from deviations of this target. The animal’s response can be characterized by four parameters: the start and end times of a perturbation, the immediate reduction in daily feed intake at the start of the perturbation (resistance trait) and the pig’s capacity to overcome the perturbing effect through compensatory feed intake (resilience trait). We then applied the model to quantify the response of group-housed pigs to a diet contaminated with mycotoxins in one or two periods of the experiment. The model proved its capacity to detect and quantify the response of pigs to mycotoxins. Characteristics of animal’s response obtained from the model can be applied to phenotype animals in genetic selection or in management strategies.
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  • HAL Id : tel-02790092, version 1
  • PRODINRA : 495067

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Hieu Nguyen Ba. Quantification of the feed intake response of growing pigs to perturbations – A modelling approach. Animal biology. AGROCAMPUS OUEST, 2020. English. ⟨tel-02790092⟩

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