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Modelling the effect of heat stress on feed intake, heat production and growth

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A heat balance model was combined with a food intake model and a metabolism model, to form a larger model which estimates a pig’s response to heat stress. The combined model was implemented as a computer program, and used to calibrate, test and validate parts of the heat balance model. Heat transfer modes considered were convection, radiation and evaporation of water at the skin, and heating and humidification of air by breathing. Sensitivity analysis revealed a large effect of air temperature, humidity and velocity on heat loss, especially in a hot environment.
2004

Moins de protéines au sevrage pour réduire les antibiotiques

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Didier Gaudré, Porc Mag (FRA), 2017, n° 525, novembre, p. 33

La réduction de la teneur en protéines de l'aliment sevrage permet-elle de réduire l'incidence de pathologies digestives dans les jours qui suivent le sevrage ? Oui, mais certaines conditions doivent être respectées.

2017

Moins de tourteau de soja dans les aliments porcs

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Le tourteau de soja est resté longtemps la source de protéines la plus utilisée dans les aliments porcs.

Or, le recours à cette matière première est remis en question depuis quelque temps en raison de la forte augmentation de son prix sur le marché des matières premières.
PDF icon Moins de tourteau de soja dans les aliments porcs
2010

Multi-objective formulation is an efficient methodology to reduce environmental impacts of pig feeds

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Florence Garcia-Launay et al., 10es International Conference on Life Cycle Assessment of Food 2016, Dublin, Irlande du Nord, Royaume-Uni, 19-21 octobre 2016, 8 pages

The production of pig feeds has a major contribution to climate change, energy use and land occupation impacts of the animal product. Nonetheless, the traditional least-cost (LC) feed formulation methods minimize the cost of the feed mix, without consideration of its environmental impacts. The objective of this study was to estimate the potential mitigation of environmental impacts calculated by Life Cycle Assessment through a multi-objective formulation of pig feeds, in the French context. The linear programming problem built searches the best feed formula under nutritional constraints with a multi-objective function including an economic price index (price of the feed mix relative to LC formulation) and an environmental impacts index (environmental impacts relative to LC formulation). A weighting coefficient between price and environment (α) ranging from 0 to 1 was included. Growing and finishing feeds were formulated with two scenarios of feed ingredients availability (current limited LIM, increased NLIM) and 4 scenarios of feed ingredient prices. When increasing αfrom 0 to 0.5, the environmental indexes of the growing and finishing feeds dropped down to -10% in LIM and down to -17 to -20% in NLIM scenario, respectively. Concomitantly, the average feed price increased by 1.5% in LIM and 1.7% in NLIM. For α higher than 0.5, the environmental index was almost no further reduced. At α=0.5, all the impacts considered were reduced relatively to LIM-LC, excepted for land occupation in NLIM. The low-impact feeds incorporated higher proportions of pea and wheat middlings and lower proportions of meals (rapeseed and sunflower) than LC formulated feeds. The multi-objective formulation of pig feeds is an efficient methodology to find low-impact feeds according to a given economic scenario. Improving the availability of some feed ingredients (pea, co-products of wheat…) at the territory level would allow (at same feed’s nutritional composition) further reduction of pig feeds impacts relatively to the current French context. Multi-objective formulation can provide a decision support tool to the feed industry to produce low-impact feeds for the pig production chain.

Document réservé Espace Pro, veuillez vous identifier
2016

Multi-year survey on chemical composition of de-oiled regular rapeseed meal produced in France. Evaluation for long-term feeding of sows in reproduction

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PDF icon Multi-year survey on chemical composition of de-oiled regular rapeseed meal produced in France. Evaluation for long-term feeding of sows in reproduction
2009

Multiobjective formulation is an effective method to reduce environmental impacts of livestock feeds

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Florence Garcia-Launay et al., British Journal of Nutrition, 2018, volume 120, n° 11, décembre, 12 pages

Environmental and economic performances of livestock production are related largely to the production of complete feeds provided on commercial farms. Formulating feeds based on environmental and economic criteria appears a suitable approach to address the current challenges of animal production. We developed a multiobjective (MO) method of formulating feed which considers both the cost and environmental impacts (estimated via life cycle assessment) of the feed mix. In the first step, least-cost formulation provides a baseline for feed cost and potential impacts per kg of feed. In the second, the minimised MO function includes normalised values of feed cost and impacts climate change, P demand, non-renewable energy demand and land occupation. An additional factor weights the relative influence of economic and environmental objectives. The potential of the method was evaluated using two scenarios of feed formulation for pig, broiler and young bulls. Compared to baseline feeds, MO-formulated feeds had lower environmental impacts in both scenarios studied (&‡22;2 to &‡22;48 %), except for land occupation of broiler feeds, and a moderately higher cost (1–7 %). The ultimate potential for this method to mitigate environmental impacts is probably lower than this, as animal supply chains may compete for the same low-impact feed ingredients. The method developed complements other strategies, and optimising the entire animal production system should be explored in the future to substantially decrease the associated impacts.

https://www6.inra.fr/ecoalim/content/download/3235/33130/version/1/file/multiobjective_formulation_is_an_effective_method_to_reduce_environmental_impacts_of_livestock_feeds_BJN_2018.pdf

2018

Mycotoxines : que se passe-t-il si les porcelets sont exposés ?

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La répartition hétérogène des mycotoxines dans les céréales peut expliquer des teneurs dépassant ponctuellement la valeur recommandée pour l’alimentation des porcs en Europe.
Une expérimentation montre qu’une courte exposition initiale à un niveau de déoxynivalénol supérieur à la recommandation n’a pas d’effet visible sur la santé des porcs et les performances d’engraissement.

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2012

Nos aliments changent de siècle : faut-il croire aux produits miracles ?

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1999

Note conjoncture Aliment - octobre 2007

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Note conjoncture Aliment - octobre 2007

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2007

Note de conjoncture Aliment - août 2006

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Note de conjoncture Aliment - août 2006

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2006

Note de conjoncture Aliment - août 2007

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Note de conjoncture Aliment - août 2007

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2007

Note de conjoncture Aliment - Août 2008

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Note de conjoncture Aliment - Août 2008

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2008

Note de Conjoncture Aliment - Août 2009

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Note de Conjoncture Aliment - Août 2009

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2009

Note de conjoncture Aliment - avril 2006

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Note de conjoncture Aliment - avril 2006

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2006

Note de conjoncture Aliment - avril 2007

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Note de conjoncture Aliment - avril 2007

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2007

Note de conjoncture Aliment - avril 2008

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Note de conjoncture Aliment - avril 2008

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2008

Note de conjoncture Aliment - avril 2009

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Note de conjoncture Aliment - avril 2009

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2009

Note de conjoncture Aliment - décembre 2006

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Note de conjoncture Aliment - décembre 2006

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2006

Note de conjoncture Aliment - décembre 2007

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Note de conjoncture Aliment - décembre 2007

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2007

Note de conjoncture Aliment - décembre 2008

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Note de conjoncture Aliment - décembre 2008

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2008

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