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Towards the quantitative characterization of piglets’ robustness to weaning: A modelling approach

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Manuel Revilla et al., Biorxiv, 2018, 26 septembre, 30 pages

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 to weaning. This work aimed at developing a modelling approach for facilitating the quantification of piglet resilience to weaning. We monitored 325 Large White pigs weaned at 28 days of age 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 one week later for collecting haematological data. We constructed a dynamic model 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 biological 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 characterization of robustness.

https://www.biorxiv.org/content/biorxiv/early/2018/09/27/428920.full-text.pdf

2018

Towards the quantitative characterization of piglet robustness to weaning: A modelling approach

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M. Revilla et al., 69th Annual meeting of the european federation of animal science (EAAP), Dubrovnik, Croatie, 27-31 août 2018 

Weaning is a critical phase in swine production conditions because piglets cope with different stressors that impact its health. During this period, the prophylactic use of antibiotics is still frequent to limit piglet morbidity, which raises economic and public health concerns such as the growing number of antimicrobial-resistant agents. 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 animal resilience to weaning. This task is hampered by the multiple-component nature of robustness. This work aimed at developing a modelling approach for facilitating the quantification of piglet resilience to weaning. We monitored 414 Large White pigs housed and fed conventionally during the post-weaning period without antibiotic administration. Body weight and diarrhoea scores were recorded before and after weaning. We constructed a dynamic model based on the Gompertz-Makeham law to describe live weight 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). The transition time between the two windows is individual specific as well as model calibration, performed for each animal. The model captured the weight dynamics of animals at different degrees of perturbation. The power of the model is that it provides biological parameters that inform on the amplitude and length of perturbation, and the rate of animal recovery. We are currently investigating how to combine these proxy parameters to provide a robustness/resilience index to weaning. Next step is to correlate this index with individual diarrhoea scores and other health status measurements such as blood biomarkers and faecal microbiota diversity.
We foresee that this study will provide a step forward in the quantitative characterisation of robustness.

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2018

Towards the quantitative characterisation of piglets’ robustness to weaning: A modelling approach

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M Revilla et al., Animal, 2019, volume 16, mai, 11 pages

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.

https://www.cambridge.org/core/services/aop-cambridge-core/content/view/18FBD3614BA779E09D061744323CF5DD/S1751731119000843a.pdf/towards_the_quantitative_characterisation_of_piglets_robustness_to_weaning_a_modelling_approach.pdf

2019

Towards a decision support tool with an individual-based model of a pig fattening unit

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Alice Cadéro et al., Computers and Electronics in Agriculture, 2018, volume 147, avril, p. 44-50

European pig production is encountering many economic and environmental challenges. To address these challenges, farmers need tools to assess the sustainability of their production systems and to make changes to ensure their sustainability. Decision support tools can help farmers to simulate and understand the influence of their management practices on production system performance. In a previous article, we described a dynamic pig fattening unit model that considers individual variability in pig performance, farmers’ practices and animal management and estimated environmental impacts (through Life Cycle Assessment) and economic results of the unit. This model is intended to be included in a decision support tool, which requires appropriate parameterisation for on-farm application and assessment to guarantee the quality of predictions. The objective of the present article is to develop a process to adequately parameterise a model for on-farm use, apply it to the pig unit model, and evaluate it using external data from commercial farms. Twenty-one pig farms were surveyed in western France in 2015 to collect data on animal performance, batch and shipping management, and farming practices. The parameterisation process was divided into six steps which correspond to incremental parameterisation of the model using data collected in the survey. The first step consists of parameterising the inputs related to farm infrastructure and management. The second step consists of setting initial mean weight and age of pigs at the beginning of fattening equal to those observed on each farm. The third step consists of three successive parameterisations for targeted slaughter weight, mean protein deposition, and mean feed intake. Steps four, five and six are iterations of step three. Each input parameterisation step improved predictions, with a decrease in the squared bias, non-unity slope and lack of correlation between predicted and observed data. For slaughter weight (SW), the root mean squared error (RMSE) decreased from 3.25 to 0.83 kg (i.e. from 2.8 to 0.7% of mean SW). For average daily gain (ADG), the RMSE decreased from 58.9 to 14.3 g live weight (LW)/day (i.e. from 7.3 to 1.8% of ADG). For the feed conversion ratio(FCR), the RMSE decreased from 0.22 to 0.03 kg feed/kg LW (i.e. from 7.8 to 1.1% of mean FCR). Considering the final RMSE values, the parameterisation process developed appears suitable for calibrating the model for future use in a decision support system.

2018

Toward the reduction of nitrite in cured meat : role of ascorbate

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Aline Bonifacie (Inrae) et al., 66th Congress of meat science and technology (ICOMST) and 73rd reciprocal meat conference, 2-7 août 2020, Etats-Unis (conférence virtuelle), poster

Nitrite and/or nitrate added in cured meat are involved in the formation of nitroso-compounds (nitrosamines, nitrosothiols and nitrosylheme) potentially mutagenic. Oxidation in meat affects health by formation of mutagenic aldehydes. An excessive consumption of cured meat is associated with an increased risk of colorectal cancer. Therefore, the objective of this study was to evaluate the role of ascorbate regarding the reduction of nitrites in cured meat.

PDF icon Alice Bonifacie et al., 66th ICOMST et 73rd RMC, 2-7 août, poster, PDF icon Alice Bonifacie et al., 66th ICOMST, 2-7 août, poster
2020

Toward the prediction of the PSE-Like muscle mefect in cooked hams

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Laetitia Théron (Inrae), Meat and Muscle Biology, 2020, volume 4, n°2, juillet, 6 pages

Pale Soft Exudative (PSE)-like muscle defect is of great importance in the cooked ham industry because of the economic losses it can cause. The flagship product is the “Jambon supérieur,” a polyphosphate-free cooked ham, usually sold sliced and packaged. Slicing is an automatic process that reveals the defect as holes in the slice leading to slicing losses. Up to now, the PSE-like defect has only been detected on raw meat after deboning the pork leg because it affects the inner part of the semimembranosus muscles and also the adductor muscles. The objective of this study was to develop innovative approaches that combine mechanistic elucidation and the discovery of potential biomarkers (i) at the level of the muscle and (ii) at the level of the live animal by analyzing proteins from plasma. The use of chemometrics for the spectral fingerprinting of pig plasma was chosen to predict the PSE-like muscle defect in raw hams.

source : https://www.iastatedigitalpress.com/mmb/article/11156/galley/10837/download/

2020

Toward the prediction of PSE-like muscle defect in hams: Using chemometrics for the spectral fingerprinting of plasm

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Laetitia Théron (Inrae), Food Control, 2020, volume 109, mars

PSE-like muscle defect is of great importance in the cooked ham industry because of the economic losses it can cause. Although this muscle defect has been widely studied from a mechanistic angle, there is a lack of reliable and practical markers. This study proposes the use of chemometrics for the spectral fingerprinting of pig plasma to predict the PSE-like muscle defect in cooked hams. Both MALDI-TOF mass spectrometry and ATR-FTIR spectroscopy were used to obtain protein and chemical function fingerprints. Though the two approaches showed very good predictive capacity, MALDI-TOF mass spectrometry was found to be better suited to predicting normal hams, i.e. hams without the defect; while ATR-FTIR spectroscopy was found to be better suited to predicting the PSE-like muscle defect. These results demonstrated the feasibility of predicting the PSE-like defect using spectral fingerprinting and chemometrics approaches.

2020

Tourteau de colza

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2010

Tour du monde de la recherche porcine : les enjeux convergent !

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L'Ifip a récemment fait un point sur les travaux en matière de recherche porcine mondiale. Cela permet d'apprécier les questions d'actualité en regard de la compétitivité, des évolutions réglementaires ou encore de l'image de la filière porcine.
2011

Topical trends in the French pig carcass grading

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PDF icon Topical trends in the French pig carcass grading
2009

Toolbox des outils simples et pratiques

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Visuels d'intervention présentés par Michel Marcon et Johan Thomas, Space 2019, 10-13 septembre 2019, Rennes (Matinales de l'Ifip), 5 pages

PDF icon Michel Marcon et Johan Thomas, Space 2019, 10-13 septembre 2019, Rennes (Matinales de l'Ifip), 5 pages
2019

Toolbox de l'Ifip audite les bâtiments sur smartphone

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Michel Marcon, Réussir Porc/ Tech Porc (FRA), 2019, n° 271, septembre, p. 50-51

L’application Toolbox mise au point par l’Ifip propose quatre calculettes pour un auto-audit simple et rapide de la ventilation, du chauffage, des équipements et de la conduite.

PDF icon Michel Marcon, Réussir Porc/ Tech Porc (FRA), 2019, n° 271, septembre, p. 50-51
2019

Tomographie RX : un outil pour optimiser le salage et séchage du jambon

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La mise au point d’un outil de mesure non destructif et rapide permettant de suivre les cinétiques de salage/séchage permettrait aux industriels d’évaluer en temps réel le comportement des jambons secs, réduisant ainsi les délais, risques et coûts liés aux modifications de process (durée de salage, conditions de séchage,…).
Le tomographe RX, qui permet de distinguer les différences de densité entre tissus, est susceptible de distinguer les variations physicochimiques causées par les flux de sel et d’eau au sein des produits.

PDF icon bilan_2012web_51.pdf
2013

Tolérance des porcs aux facteurs anti-trypsiques du soja

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Fiche n° 075 : facteurs de productivité des élevages

La valorisation du soja en alimentation animale n’est possible que lorsque les facteurs antinutritionnels ont été détruits par un traitement thermique.
Toutefois, la culture du soja à proximité de la production porcine explique des travaux (Etats-Unis, Allemagne, Italie) sur l’emploi de graines crues dans les aliments porcins.
Parallèlement, certaines variétés de soja dont la teneur en facteurs anti-trypsiques est diminuée environ de moitié pourraient permettre une utilisation directe ou un traitement thermique moins intense.
Alors que les travaux antérieurs fixaient souvent un taux maximum de graine crue dans les aliments, cette nouvelle étude vise à fixer une limite en unités de facteurs antitrypsiques (UTI/mg) et à évaluer l’intérêt de graines produites régionalement en Midi-Pyrénées.
Des variétés de soja à teneur en facteurs anti-trypsiques standard (Isidor et Ecudor) ou faible (Bahia) ont été cultivées par le Lycée de Moissac (82) et incorporées dans les aliments préparés dans la station d’expérimentation de Villefranche-de-Rouergue (12), à des taux allant de 2.5 à 12.5 %.

PDF icon fiche_bilan2014_075.pdf
2015

Thèse sur la controverse autour de l’élevage

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Elsa Delanoue (IDELE) et Christine Roguet (IFIP), bilan 2017, éditions IFIP, mai 2018, p. 62

En parallèle et en étroit partenariat avec le projet Casdar ACCEPT, est réalisée depuis 2014 une thèse de sociologie sur la controverse autour de l’élevage en France. L’Ifip participe au co-encadrement de la thèse, avec le laboratoire ESO de l’Université Rennes 2, l’Itavi et l’Institut de l’Elevage.
La controverse sur l’élevage témoigne de l’existence au sein de la société française de différentes façons de penser l’élevage. L’objectif de la thèse est d’analyser cette controverse : Quels sens s’affrontent dans l’espace public concernant l’élevage, par qui sont-ils portés, et quelle forme la lutte entre les modes de pensée prend-t-elle ?

PDF icon Elsa Delanoue (IDELE) et Christine Roguet (IFIP), bilan 2017, éditions IFIP, mai 2018, p. 62, fiche n° 31
2018

Thermal inactivation of infectious Hepatitis E virus in experimentally contaminated food

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Hepatitis E virus (HEV) infection of zoonotic origin is an emerging concern in industrialized countries. In the past few years, several cases of zoonotic hepatitis E have been identified and the consumption of food products derived from pork liver have been associated with clusters of human cases. More specifically, raw or undercooked pork products have been incriminated. Few data on the effect of heating on HEV inactivation in food products are available.
2012

Thermal imaging use for heat treatment qualification : the case of singeing

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Thierry Lhommeau et al., FAIM IV : fourth annual conference on body and carcass evaluation, meat quality software and treaceability, 22-23 septembre 2015, Edimbourg, écose, poster

Singeing is dedicated to improving the visual aspect and reducing surface bacterial contamination of pig carcasses. However more needs to be discovered about the variability of the surface temperatures reached after singeing within a production day and on the different parts of the carcasses. Thermal imaging is now widely developed. This study aimed at assessing if and how this technology could be used to study surface temperatures reached after singeing.

PDF icon Thierry Lhommeau et al., FAIM IV , Edimbourg, Ecosse, poster
2015

The welfare of growing pigs in five different production systems: assessment of feeding and housing

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Ninety-one farms were visited over a 2-year period to assess the welfare of growing pigs in five different production systems found either in France or in Spain using the Welfare Quality® protocol. This study focused on animal-based measures as indicators of ‘good feeding’ and ‘good housing’. Multiple Generalized Linear Mixed Models were performed for each measure to evaluate the differences between production systems and to detect possible causal factors.
2012

Thé vert et vitamine E pour protéger les oméga 3 issus de lin

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Dans une démarche nutritionnelle d'enrichissement en oméga 3 de la viande de porc, il est essentiel que les oméga 3 parviennent jusqu'à l'assiette du consommateur. Une des stratégies pour protéger ces acides gras consiste à enrichir la ration par des antioxydants : l'extrait de thé vert et la vitamine E ont été testés dans cet essai.

PDF icon techporc_vautier_n5_2012.pdf
2012

The preventive role of feeding practices

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2013

Pages