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                <title level="j">Animal</title>
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                  <publisher>Published by Elsevier (since 2021) / Cambridge University Press (until 2020)</publisher>
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                  <biblScope unit="issue">11</biblScope>
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                  <date type="datePub">2019</date>
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              <idno type="doi">10.1017/S1751731119000843</idno>
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                <term xml:lang="en">resilience</term>
                <term xml:lang="en">body weight</term>
                <term xml:lang="en">dynamic modelling</term>
                <term xml:lang="en">swine</term>
                <term xml:lang="en">sucking pig</term>
                <term xml:lang="en">weaning</term>
                <term xml:lang="en">modelling</term>
                <term xml:lang="en">mathematical model</term>
                <term xml:lang="en">pigs</term>
                <term xml:lang="en">perturbation</term>
                <term xml:lang="fr">porcelet</term>
                <term xml:lang="fr">porc</term>
                <term xml:lang="fr">robustesse des animaux</term>
                <term xml:lang="fr">sevrage</term>
                <term xml:lang="fr">modélisation</term>
                <term xml:lang="fr">modèle mathématique</term>
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              <classCode scheme="vocinrae-old" n="robustesse des animaux">robustesse des animaux</classCode>
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              <classCode scheme="vocinrae-old" n="porcelet">porcelet</classCode>
              <classCode scheme="vocinrae-old" n="modèle mathématique">modèle mathématique</classCode>
              <classCode scheme="vocinrae-old" n="modélisation">modélisation</classCode>
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              <p>Weaning is a critical transition phase in swine production in which piglets must cope with different stressors that may affect their health. During this period, the prophylactic use of antibiotics is still frequent to limit piglet morbidity, which raises both economic and public health concerns such as the appearance of antimicrobial-resistant microbes. With the interest of developing tools for assisting health and management decisions around weaning, it is key to provide robustness indexes that inform on the animals’ capacity to endure the challenges associated with weaning. This work aimed at developing a modelling approach for facilitating the quantification of piglet resilience to weaning. A total of 325 Large White pigs weaned at 28 days of age were monitored and further housed and fed conventionally during the post-weaning period without antibiotic administration. Body weight and diarrhoea scores were recorded before and after weaning, and blood was sampled at weaning and 1 week later for collecting haematological data. A dynamic model was constructed based on the Gompertz–Makeham law to describe live weight trajectories during the first 75 days after weaning, following the rationale that the animal response is partitioned in two time windows (a perturbation and a recovery window). Model calibration was performed for each animal. Our results show that the transition time between the two time windows, as well as the weight trajectories are characteristic for each individual. The model captured the weight dynamics of animals at different degrees of perturbation, with an average coefficient of determination of 0.99, and a concordance correlation coefficient of 0.99. The utility of the model is that it provides biologically meaningful parameters that inform on the amplitude and length of perturbation, and the rate of animal recovery. Our rationale is that the dynamics of weight inform on the capability of the animal to cope with the weaning disturbance. Indeed, there were significant correlations between model parameters and individual diarrhoea scores and haematological traits. Overall, the parameters of our model can be useful for constructing weaning robustness indexes by using exclusively the growth curves. We foresee that this modelling approach will provide a step forward in the quantitative characterisation of robustness.</p>
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