Towards the characterisation of animal robustness by dynamic energy allocation indicators in fattening pigs
Résumé
The objectives of this study were to investigate the possibility of characterising animal
robustness by using indicators based on the dynamics of energy allocation of the animal and
to determine their genetic parameters. A total of 2 140 pigs, from the Piétrain NN Français
line, were raised at the AXIOM boar testing station. This farm was equipped with automatic
feeding system, recording individual weight and feed intake at each visit. We used a dynamic
linear regression model to characterize the evolution of the allocation factor ( αt) between
cumulative net energy available, estimated from feed intake, and cumulative weight gain
during fattening period. The variance of α t, that could be interpreted as an indicator of the
response of the animal to perturbations/stress, showed moderate heritability (0.27 ±0.08). Our
perspective is to further decompose the allocation factor into components to better
characterise the robustness phenotyp
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