Evaluation of the environmental implications of the incorporation of feed-use amino acids in pig production using Life Cycle Assessment

Feed-use (FU) amino acids, at constant performance, make it possible to reduce the protein content of pig feeds and nitrogen excretion by the animals. The aim of this study was to assess the environmental impact of pig production in a conventional farm by Life Cycle Assessment (LCA) according to several scenarios of FU amino acid incorporation. Two modalities of waste management (slurry or solid manure), two hypotheses of protein sources (soybean meal only, or soybean meal, rapeseed meal and pea) and two soybean origins (Centre-West Brazil vs. average Brazilian soybean) were considered. In each scenario investigated, gestating, lactating, pre-starter and starter feeds were formulated. Fattening pigs were fed either with only one feed (1P), or with two feeds (2P) or according to multiphase feeding (MP). In three scenarios, feeds were least-cost formulated: without incorporation of FU amino acids (NoAA), with FU amino acid incorporation and reduced protein content (LowCP), and FU amino acid incorporation with free protein content (Min€). In the fourth scenario (MinCP), feeds were formulated to minimize protein content. The average protein content of pig feeds decreased, from 190 g/kg in 1P-NoAA down to 123 g/kg in MP-MinCP while FU amino acid incorporation increased. At the same time, the incorporation of soybean meal into feeds decreased from 197 kg/t down to 70 kg/t in MP-MinCP. This reduction of soybean meal incorporation was concomitant with a decrease in feed cost. The incorporation of FU amino acids in low protein diets clearly reduced the impacts of pig production on Climate Change (CC), Acidification (AC) and Eutrophication (EU). The lowest CC, AC and EU potential impacts were reached with the Min€ or MinCP scenarios, for which tryptophan and valine were incorporated in pig feeds. The impacts on terrestrial ecotoxicity, cumulative energy demand and land occupation were less sensitive to the studied scenarios. The combination of FU amino acid incorporation and multiphase feeding of growing-finishing pigs produced the largest reduction of CC, AC and EU impacts. The underlying mechanisms include the substitution of soybean meal and extruded soybean by cereals and FU amino acids and the reduction of nitrogen excretion which further reduces nitrous oxide and ammonia emissions. This study suggests that environmental impacts of pig production in France can be further reduced through feeding practices, especially for acidification, eutrophication and climate change.

[1]  S G Sommer,et al.  INTERACTIONS BETWEEN PHOSPHORUS FEEDING STRATEGIES FOR PIGS AND DAIRY COWS AND SEPARATION EFFICIENCY OF SLURRY , 2008, Environmental technology.

[2]  C. Basset-Mens,et al.  Scenario-based environmental assessment of farming systems: the case of pig production in France , 2005 .

[3]  J. Pallauf,et al.  Microbial phytase combined with amino acid supplementation reduces P and N excretion of growing and finishing pigs without loss of performance , 2002 .

[4]  A. Aarnink,et al.  Odour and ammonia emission from pig manure as affected by dietary crude protein level , 2009 .

[5]  S. Payraudeau,et al.  Analysis of the uncertainty associated with the estimation of nitrogen losses from farming systems , 2007 .

[6]  S. Colombini,et al.  Effects of high fibre and low protein diets on performance, digestibility, nitrogen excretion and ammonia emission in the heavy pig , 2010 .

[7]  M. D. Vries,et al.  Comparing environmental impacts for livestock products: A review of life cycle assessments , 2010 .

[8]  Masson-Delmotte,et al.  The Physical Science Basis , 2007 .

[9]  I Traulsen,et al.  Environmental Impact Assessment--methodology with special emphasis on European pork production. , 2012, Journal of environmental management.

[10]  Celine Ginneberge,et al.  Carbon footprint of five pig diets using three land use change accounting methods , 2012 .

[11]  Takashi Osada,et al.  Life cycle assessment of Japanese pig farming using low-protein diet supplemented with amino acids , 2013 .

[12]  Lisbeth Mogensen,et al.  Fossil energy and GHG saving potentials of pig farming in the EU , 2010 .

[13]  S. Bremner,et al.  Sensitivity analysis 2 , 2015 .

[14]  Helena Elmquist,et al.  Environmental Systems Analysis of Pig Production - The Impact of Feed Choice (12 pp) , 2005 .

[15]  H.M.G. van der Werf,et al.  Methods and data for the environmental inventory of contrasting pig production systems , 2007 .

[16]  J. van Milgen,et al.  Effect of high temperature and low-protein diets on the performance of growing-finishing pigs. , 2002, Journal of animal science.

[17]  C. Pomar,et al.  Development of sustainable precision farming systems for swine: estimating real-time individual amino acid requirements in growing-finishing pigs. , 2012, Journal of animal science.

[18]  B. Bathe,et al.  Microbial production of l-amino-acids , 2003 .

[19]  J. Noblet,et al.  Effects of exposure to high ambient temperature and dietary protein level on performance of multiparous lactating sows. , 2001, Journal of animal science.

[20]  Aeo Malau-Aduli,et al.  Modelling nutrient digestion and utilisation in farm animals , 2010 .

[21]  Jean-Yves Dourmad,et al.  InraPorc: A model and decision support tool for the nutrition of sows ☆ , 2008 .

[22]  M Hassouna,et al.  Modelling of manure production by pigs and NH3, N2O and CH4 emissions. Part II: effect of animal housing, manure storage and treatment practices. , 2010, Animal : an international journal of animal bioscience.

[23]  Thi Tuyet Hanh Nguyen,et al.  Effects of type of ration and allocation methods on the environmental impacts of beef-production systems , 2012 .

[24]  T. J. Kim,et al.  Efficacy of a reduced protein diet on clinical expression of post-weaning diarrhoea and life-time pe , 2011 .

[25]  José I. Martínez,et al.  Effect of lowering dietary crude protein on nitrogen excretion, manure composition and ammonia emission from fattening pigs , 2004 .

[26]  C. F. Hansen,et al.  Effects of feeding low protein diets to piglets on plasma urea nitrogen, faecal ammonia nitrogen, the incidence of diarrhoea and performance after weaning , 2008, Archives of animal nutrition.

[27]  Nathan Pelletier,et al.  Life cycle assessment of high- and low-profitability commodity and deep-bedded niche swine production systems in the Upper Midwestern United States , 2010 .

[28]  Pour Des Pratiques Agricoles Estimation des rejets d'azote - phosphore - potassium - cuivre et zinc des porcs. , 2003 .

[29]  H. V. D. van der Werf,et al.  Evaluation of the environmental implications of the incorporation of feed-use amino acids in the manufacturing of pig and broiler feeds using Life Cycle Assessment. , 2011, Animal : an international journal of animal bioscience.

[30]  Luciano Hauschild,et al.  Precision feeding can significantly reduce feeding cost and nutrient excretion in growing animals , 2011 .

[31]  A. Aarnink,et al.  Nutrition, key factor to reduce environmental load from pig production , 2007 .

[32]  I. Shinzato,et al.  Potential reduction of greenhouse gas emission from swine manure by using a low-protein diet supplemented with synthetic amino acids , 2011 .

[33]  Iain Dunning,et al.  OpenSolver: Open source optimisation for excel , 2010 .

[34]  Vamilson Prudêncio da Silva,et al.  Variability in environmental impacts of Brazilian soybean according to crop production and transport scenarios. , 2010, Journal of environmental management.

[35]  W. Leuchtenberger,et al.  Biotechnological production of amino acids and derivatives: current status and prospects , 2005, Applied Microbiology and Biotechnology.

[36]  C. Pomar,et al.  Modelling of manure production by pigs and NH3, N2O and CH4 emissions. Part I: animal excretion and enteric CH4, effect of feeding and performance. , 2010, Animal : an international journal of animal bioscience.

[37]  H. V. D. Werf,et al.  Using environmental constraints to formulate low-impact poultry feeds [Conference poster]. , 2012 .

[38]  A.J.A. Aarnink,et al.  Dietary protein affects nitrogen excretion and ammonia emission from slurry of growing-finishing pigs. , 1998 .

[39]  J. Hatfield,et al.  Emissions from livestock and manure management. , 2006 .

[40]  Jean-Yves Dourmad,et al.  InraPorc: A model and decision support tool for the nutrition of growing pigs , 2008 .

[41]  D. Moran,et al.  Livestock production and greenhouse gas emissions: defining the problem and specifying solutions , 2011 .

[42]  M. Ikeda Amino acid production processes. , 2003, Advances in biochemical engineering/biotechnology.