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Modelling interactions between farmer practices and fattening pig performances with an individual-based model

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Alice Cadéro et al., Animal, 2017, novembre, 10 pages

European pig production continues to encounter economic and environmental challenges. To address these issues, methods have been developed to assess performances of pig production systems. Recent studies indicate that considering variability in performances among pigs improves the accuracy and reliability of results compared with modelling an average animal. Our objective was to develop a pig fattening unit model able to (i) simulate individual pig performances, including their variability in interaction with farmers’ practices and management, and (ii) assess their effects on technical, economic and environmental performances. Farmer practices included in the model were chosen from a typology generated from on-farm surveys focused on batch management, pig allocation to pens, pig feeding practices, practices of shipping to the slaughterhouse, and management of the remaining pigs. Pigs are represented using an individual-based model adapted from the InraPorc® model. To illustrate the model’s abilities, four scenarios were simulated that combine two feed rationing plans (ad libitum, restricted to 2.5 kg/day) and two feed sequence plans (two-phase, 10-phase). Analysis of variance was performed on the simulated technical, economic and environmental indicators (calculated via Life Cycle Assessment). The feed rationing plan and feed sequence plan significantly affected all indicators except for the premium per pig, for which the feed sequence plan did not have a significant effect. The ‘restricted 10-phase’ scenario maximised gross margin of the fattening unit (14.2 €/pig) and minimised environmental impacts per kg of pig produced. In contrast, the ‘ad libitum two-phase’ scenario generated the lowest margin (8.20 €/pig) and the highest environmental impacts. The model appears to be a promising tool to assess effects of farmers’ practices, pig characteristics and farm infrastructure on technical, economic and environmental performances of the fattening unit, and to investigate the potential of improvement. However, further work is needed, based on virtual experiments, in order to evaluate the effects of a larger diversity of practices.

2017

Modelling fattening pig production systems: use of a dynamic, stochastic, mechanistic model

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Visuels de A. Cadéro et al., 67th Annual Meeting of the European Federation of Animal Science (EAAP), 29 août-02 septembre 2016, Belfast, Irlande, Royaume-Uni

Pig livestock farming systems face economic and environmental issues. To cope with these issues, models of pig production performance have been developed. However, most of them do not account for the interactions between feeding strategies, management practices and variability of performance and requirements among pigs. Our aim was to develop a model representing the pig fattening unit, taking into account the effects of the interaction between the individual variability of pigs, the farmer’s practices and the infrastructure of the farm on the performance of the unit. The farmer’s practices included in the model have been chosen from a typology developed using a farm survey that focused on penning, batch management, feeding and delivery practices. The pigs are represented using an individual-based model adapted from the InraPorc model. The model abilities have been illustrated on a typical fattening unit batch management. Feed conversion ratio is 2.73 (±0.06) kg/kg, daily feed gain is 0.856 (±0.02) kg/d. The mean slaughter weight is 119.6 (±0.83) kg with a mean slaughter age of 176.0 (±1.89) days. This predicted performance is in accordance with the mean performance in French farms, considering the same batch management. This model will allows to evaluate the technical performance of a large range of fattening units, in terms of farm size, type of infrastructure and of management. In the near future, this model will be completed with calculation of economic results and environmental impacts of the pig fattening unit. 

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2017

Elaboration of an experimental model of the oxidative stress in weaned piglets

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Visuels de Eric Royer et al., 67th Annual Meeting of the European Federation of Animal Science (EAAP), 29 août-02 septembre 2016, Belfast, Irlande, Royaume-Uni

An experimental model was established as tool for the study of the oxidative stress in weaning pigs. In two experiments, 360 weaned piglets were randomly allocated to eight groups in 2×2×2 factorial designs. In Exp.1, the factors were the sex, a vaccination at weaning against porcine circovirus type 2 (PCV2) or not, and phase 1 diets with NRC (2012) levels for vitamin E and selenium (SA) or extra supplementation in vitamin E, selenium yeast and superoxide dismutase-rich melon supplement (HA). In Exp.2, a double vaccination against PCV2 and porcine influenza, heat stress at d 9-10, 23 24 and 37-38 (36.5 °C over 6 h period) or controls, and SA or HA diets were applied. Blood samples were taken from 6 piglets per treatment at d 13, 28 and 40 in Exp.1 and d 13 and 40 in Exp.2. Serum haptoglobin, glutathione peroxidase activity (GPx), blood lipid peroxides and protein carbonyls were determined. Half-hemolysis time (HT50) of whole blood (WB) and red blood cells (RBC) exposed to a controlled free radical attack were determined. The HA supplementation increased HT50 of WB and RBC (P<0.02) in Exp.2, as well as HT50 of WB at d13 (interaction, P=0.04) and RBC of non-vaccinated pigs (interaction, P=0.05) in Exp.1. In Exp.2, GPx increased (P=0.01), whereas lipid peroxides (P=0.01) and protein carbonyls (P=0.05) decreased as a result of HA diet. Vaccinations increased haptoglobin in Exp.1 and 2, as well as lipid peroxides in Exp.2 (P=0.05). Moreover, the double vaccination decreased GPx activity for HA fed pigs at d 40 (interaction, P=0.05) in Exp.2, and protein carbonyls in Exp.1 and 2 (P<0.06).

Vaccination × heat stress × time interactions (P<0.05) were observed on HT50 values in Exp.2. At d 40, heat stress decreased WB (P=0.01) and RBC HT50 (P<0.01) for the vaccinated piglets, whereas such effects were not observed for the non-vaccinated piglets. In conclusion, a model based on heat stress and vaccination may be efficient to assess strategies limiting oxidative stress.

PDF icon Visuels de Eric Royer et al., 67th EAAP, 29 août-02 septembre 2016,Belfast, Irlande
2017

Controlling the microbiological quality of fresh sausages with reduced nitrite content by means of biopreservation

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Carole Feurer et al., 3rd International Symposium on Fermented Meat (ISFM), Clermont-Ferrand, 27-29 septembre 2017, poster

Potassium and sodium nitrite (E249 and E250) are used as preservatives and added to meat products to allow, amongst others, the development of the pink color specific to cured meat products. Because nitrite is a co-carcinogen molecule, some disparage its use in food processing, and rules are currently under review to reduce their amount in meat products. This study aimed at preparing craftsmen pork butchers for the coming shift in rules, by offering tools to keep microbiological quality of fresh sausages under control, without altering their organoleptic attributes. Here we considered the use of biopreservation to achieve this goal.

PDF icon Carole Feurer et al., 3rd ISFM, Clermont-Ferrand, 27-29 septembre 2017, poster
2017

Modeling of gaseous emission in pig production

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Visuels de Jean-Yves Dourmad et al., International Symposium on Emissions of Gas and Dust from Livestock (EMILI), Saint-Malo, France, 21-24 mai 2017

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2017

Innovative feeding strategies in pig production : incidence on gaseous emissions

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Visuels de Sandrine Espagnol et al., International Symposium on Emissions of Gas and Dust from Livestock (EMILI), Saint-Malo, France, 21-24 mai 2017

PDF icon Visuels de Sandrine Espagnol et al., EMILI 2017, Saint-Malo, France, 21-24 mai 2017
2017

Estimación de la varianza aditiva y dominante en caracteres de cerdo medidos en población pura y cruzada usando G-GIBBS

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L. Tusell et al., XVII Jornadas sobre producción animal, AIDA-ITEA, Zaragoza, Espagne, 30-31 mai 2017, p. 450-452

La expresión fenotípica de ciertos caracteres de interés en producción puede estar influenciada por efectos genéticos no aditivos tales como la dominancia, responsable, en parte, de la heterosis existente dentro de línea y en cruzamiento. Incluir la dominancia en las evaluaciones genómicas de estos caracteres podría conllevar a un aumento en la precisión de la estima de los valores de cría a la vez que dar una idea del interés en utilizar informaciones de individuos cruzados para evaluar las líneas puras por su aptitud al cruzamiento. Este estudio tiene por objetivo estimar las contribuciones genéticas aditivas y de dominancia a la varianza fenotípica total de diversos caracteres de crecimiento y eficiencia alimentaria, composición de la canal, calidad de carne, comportamiento e indicadores de olor y madurez sexual medidos en cerdo de raza pura y en cruce.

ENG

Genomic estimation of dominance genetic variance in purebred and  crossbred pig performances

This study aims at assessing the contribution of the additive and dominance genomic variances to the phenotype expression of several purebred Piétrain and crossbred (Piétrain x Large White) pig performances. A total of 636 purebred and 720 crossbred male piglets were phenotyped for 22 traits that can be classified into growth rate and feed efficiency, carcass composition, meat quality, behavior, boar taint and puberty groups of traits. Additive and dominance variances estimated in univariate genotypic models including additive and dominance genotypic effects allowed us to retrieve the additive and dominance SNP variances. These ones were used, together with the allelic frequencies of the parental populations, to obtain additive and dominance variances in terms of genetic breeding values and dominance deviations. Some traits showed relevant amount of dominance genetic  variance in both populations (i.e. backfat thickness, pH) or increased amount in crossbreds (i.e. ham cut, loin and dressing yield) suggesting that accounting for dominance in the models of these traits could lead to an increased GEBV accuracy and that using crossbred information can be beneficial to evaluate purebred candidates to selection for crossbred performance.

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2017

L’élevage sous le feu des critiques Comprendre pour agir

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Baromètre Porc (FRA), 2017, octobre, n° 479, p. 8, par Christine Roguet

Pas une semaine sans qu’une émission, un livre, une vidéo ou une manifestation ne remette en cause l’élevage. Pour comprendre leur signification et là où ces critiques pourraient conduire, les instituts techniques mènent des recherches en partenariat (avec des sociologues, chambres d’agriculture…). L’objectif du projet ACCEPT est d’aider les filières animales françaises à trouver leur voie.

PDF icon Baromètre Porc (FRA), 2017, octobre, n° 479, p. 8, par Christine Roguet
2017

Des LED pour réduire la consommation énergétique

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Yvonnick Rousselière, Porc Mag (FRA), 2017, octobre, n° 524, p. 31

L'éclairage par LED en élevage porcin apparaît comme une solution intéressante et simple pour mieux piloter la consommation électrique de l'exploitation, dans un objectif à la fois d'économie en lien avec la hausse du prix de l'électricité, et de réduction de l'impact environnemental de l'élevage.

2017

Bonnes pratiques pour le transport des animaux vivants : guide de 17 fiches techniques porcin, bovin, ovin, équin

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Checklist du conducteur pour le Transport d’Animaux Vivants : Êtes-vous bien préparé ? En tant que chauffeur professionnel, appliquer la Législation actuelle sur le transport vous aidera à atteindre des niveaux élevés de bien-être pour vos animaux. (BP issues d’une approche d’harmonisation européenne des meilleures pratiques www.animaltransportguides.eu)
 

PDF icon guide de bonnes pratiques au transport des porcs, bovins, ovins, équins
2017

Guide to good practices for the transport of pigs

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Le Guide de bonnes pratiques pour le transport des porcs a été publié par la Commission européenne dans  le but d’améliorer le bien-être animal pendant le transport. Il est le résultat d’une concertation entre transporteurs, éleveurs, abatteurs, vétérinaires, associations professionnelles, organisations non gouvernementales et autorités compétentes des Etats-membres.

Vous pouvez retrouver les Guides de bonnes pratiques pour le transport des autres espèces, ainsi que 17 fiches pratiques, sur le site ci-après :

http://animaltransportguides.eu/de/materials/

Les fiches traduites en français sont disponibles ici :

http://animaltransportguides.eu/fr/documents/

 

PDF icon Guide de bonnes pratiques pour le transport des porcs (bien-être) - 2017
2017

Micropollutants and chemical residues in organic and conventional meat

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Gaud Devilly-Pinel et al., Food Chemistry,, 2017, volume 232, 1er octobre, p. 218-228

The chemical contamination levels of both conventional and organic meats were assessed. The objective was to provide occurrence data in a context of chronic exposure. Environmental contaminants (17 polychlorinated dibenzodioxins/dibenzofurans, 18 polychlorinated biphenyls (PCBs), 3 hexabromocyclododecane (HBCD) isomers, 6 mycotoxins, 6 inorganic compounds) together with chemical residues arising from production inputs (75 antimicrobials, 10 coccidiostats and 121 pesticides) have been selected as relevant compounds. A dedicated sampling strategy, representative of the French production allowed quantification of a large sample set (n = 266) including both conventional (n = 139) and organic (n = 127) raw meat from three animal species (bovine, porcine, poultry). While contamination levels below regulatory limits were measured in all the samples, significant differences were observed between both species and types of farming. Several environmental contaminants (Dioxins, PCBs, HBCD, Zn, Cu, Cd, Pb, As) were measured at significantly higher levels in organic samples.

2017

Les débats de société sur l’élevage dans cinq pays européens

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Christine Roguet et al., Viandes et produits carnés (FRA), 2017, octobre, p. 1-6

Une analyse des controverses sur l’élevage a été réalisée en 2015 dans cinq pays de l’Union Européenne (Allemagne, Danemark, Pays-Bas, Espagne, Italie) pour évaluer dans quelle mesure elles diffèrent entre pays et leurs impacts sur l’évolution des modes d’élevages et la segmentation des marchés. L’étude a reposé sur une large bibliographie et des missions en Allemagne, Danemark et Italie. Elles ont permis de recueillir les positions d’une trentaine d’acteurs de l’élevage, de la recherche et des associations. L’étude confirme l’existence d’un gradient de préoccupations sociétales sur l’élevage, du nord au sud de l’Europe. Les controverses sont très actives dans le nord, sur de nombreux sujets (bien-être animal, santé publique, impacts environnementaux, modèles d’élevage). Elles le sont beaucoup moins dans les pays du sud, en particulier en Espagne. La montée de la contestation, les orientations données par la recherche et les pouvoirs publics, et les initiatives prises par les filières, conduisent à des changements de pratiques d’élevage dans le nord de l’Europe, pour une part croissante de production, tout en gardant le souci de la compétitivité. La création de labels « bien-être », privés et publics, s’inscrit dans un mouvement plus général, au sein de l’UE, en faveur de la création d'un étiquetage obligatoire selon le mode de production de la viande et du lait, comme pour les œufs depuis 2003. Cette comparaison européenne met en lumière la réactivité des filières nord-européennes face aux enjeux. La France doit veiller à être dans le bon tempo dans les réponses à apporter aux attentes de société. La compétitivité est aussi une question d’anticipation. 

ENG

Social debates on livestock farming within five European countries

An analysis of the controversies about livestock farming was carried out in 2015 in five countries of the European Union (Germany, Denmark, The Netherlands, Spain, Italy) to evaluate how they differ between countries as well as the responses provided for and their impact on changes in farming methods and market segmentation. The study was based on a literature review and study tours in Germany, Denmark and Italy. They made it possible to collect the positions of thirty actors of livestock farming, research and NGOs. Our study confirm the existence of a gradient of societal concerns on livestock farming, from northern to southern Europe. Controversies are very active in northern Europe on many issues (animal welfare, public health, environmental impacts, farming models). They are much less in the southern countries, especially Spain. The rise of the protest, the guidance of research and public authorities, and the initiatives of industries, are leading to changes in animal husbandry practices in northern Europe, for a growing part of production, while maintaining competitiveness.
The creation of private and public welfare labels are part of a broader movement within the EU for the creation of a mandatory label according to the mode of production of meat and milk, like that imposed for eggs by European regulation since 2003. This benchmarking study highlights the responsiveness of the northern European livestock sectors to the issues. France must ensure to be in the right tempo to respond to societal expectations. Competitiveness is also a matter of anticipation. 

PDF icon Viandes et produits carnés (FRA), 2017, octobre, p. 1-6
2017

RedLosses: REDucing food LOSSES by microbial spoilage prediction

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Monique Zagorec et al., 3rd International Symposium on Fermented Meat (ISM), Clermont-Ferrand, 27-29 septembre 2017, poster

Food spoilage leads to significant wastes and losses, and is an important economic issue in food industry. In the case of meat, a large part of spoilage is the consequence of bacterial growth and subsequent metabolic activities causing organoleptic spoilage of the final product (defects in texture, color, odor, or aspect), leading finally to products that are lost because they do not fit the quality standards. In addition, meat production chain requires energy, water and cost consuming operations (i.e. animal breeding, slaughtering, and transformation and storage which are usually performed at low temperature). Therefore meat product spoilage that appears at the end of the process or during shelf life affects the whole production chain performances as well as the sustainability label of the meat sector. The objective of the project is to reduce food losses by predicting, early in the production process, the onset of bacterial spoilage during storage in order to propose decision-support tools for directing process. Pork and poultry meat, the two main meats consumed in France will be studied. The economic impact of losses of these products will be assessed. Dynamics of bacterial communities will be monitored during processing steps (from primary cuts to end products at use-by-date and beyond) and various descriptors of spoilage will be measured. The natural variability between batches and that associated with production processes will be considered. Data will be used to identify accurate spoilage markers and to compute innovative mathematical models for predicting spoilage occurrence as a function of the initial composition of the microbiota (diversity and abundance) and some abiotic factors (lactate concentration, modified atmosphere packaging). The models will be validated on meat products, including the economic aspect in order to propose decision-support tools for the food producers. The project involves 8 academic or ITAI partners constituting the REDLOSSES consortium and 2 industrial partners producing sausages.

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2017

Traitements vétérinaires en élevage de porcs : mieux les gérer grâce à l'outil informatique GVET

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Visuels présentés par Anne Hémonic, vétérinaire IFIP,  au Space 2017, le 12 septembre 2017, à Rennes (Matinales de l'IFIP)

PDF icon Visuels d'Anne Hémonic au Space 2017, Matinales IFIP
2017

Bonnes pratiques au transport pour le respect du bien-être animal : nouveaux guides européens porcin, bovin et volaille

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Visuels de Patrick Chevillon (IFIP), Béatrice Mounaix (IDELE) et Laura Warin (ITAVI) au Space 2017, le 13 septembre 2017, à Rennes

PDF icon Visuels de Patrick Chevillon et al. au Space 2017, 13 septembre 2017, à Rennes
2017

L'élevage sous le feu des critiques : comprendre pour agir

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Visuels de Christine Roguet et al., au Space 2017, le 14 septembre, à Rennes (Matinales de l'IFIP)

PDF icon Visuels de Christine Roguet et al., au Space 2017 (Matinales de l'IFIP)
2017

Les points de vue et attentes des citoyens français sur l'élevage

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Visuels de Anne-Charlotte Dockès (IDELE) et al., au Space 2017, le 14 septembre, à Rennes (Matinales de l'IFIP)

PDF icon Visuels de Anne-Charlotte Dockès (IDELE) et al., au Space 2017 (Matinales de l'IFIP)
2017

Dynamique chinoise et impacts sur le marché mondial du porc

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Visuels de Jan-Peter Van Ferneij au Space 2017, le 15 septembre 2017, à Rennes (Matinales de l'IFIP)

PDF icon Visuels de Jan-Peter Van Ferneij au Space 2017 (Matinales de l'IFIP)
2017

Modélisation des flux d'énergie directe et indirecte pour les bâtiments des filières porcine et avicole

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Michel Marcon et al., Innovations Agronomiques (FRA), 2017, volume 55, février,  p. 55-70

Dans les élevages de porcs et de volailles dits « hors-sol », les consommations d’énergies directes sont, par nature, dépendantes des échanges thermiques entre les bâtiments et leur environnement, eux-mêmes conditionnés par la gestion de l’ambiance. L’impact de ces conditions d’ambiance sur les performances est par ailleurs bien connu au travers de nombreuses publications au cours des vingt dernières années. Il est donc apparu possible et pertinent de réaliser un outil d’aide au conseil basé sur un modèle dynamique (MEDIBATE). L’objectif de ce modèle est de prédire les consommations d’énergie occasionnées par le chauffage et la ventilation des bâtiments porcins et avicole, en relation avec des variables d’action comme les caractéristiques de la salle (isolation…), les équipements (chauffage, ventilation), la gestion de l’ambiance (températures de consigne…) et les animaux (type, nombre, stade). Les flux d’énergie indirects sont estimés à partir de la prédiction de la consommation moyenne journalière d’aliments, en tenant compte du poids vif des animaux et de la température ambiante. L’intégration future d’un bilan économique dans ce modèle permettra d’évaluer le résultat de la mise en oeuvre de différents choix techniques.

ENG

Dynamic model of direct and indirect energy exchanges in pig and poultry barns for fiels decision support

In pig and poultry farms, direct consumption of energy depends on thermal exchanges between indoor and outdoor, which are related to the rules of air parameters management in the rooms. Besides, the impact of indoor conditions is well known through an extensive literature over the last twenty years.
Therefore, it appeared possible and consistent to support field advice by designing a tool based on a dynamic model (called MEDIBATE). This model represents and predicts at barn room level the energy balance impacted by ‘action levers’ such as room characteristics (insulation) and equipment (heating, ventilation), climate control management (temperature driving) and animals (number, status). Indirect energy is calculated through the prediction of daily feed intake, considering the effect of both the live weight and ambient temperature. Finally, economic calculations will be included into the model to allow the comparison of different housing designs and management strategies.

2017

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