, J. 2010. Farm practices survey and modelling to estimate monthly NH 3 emissions from swine production in 12 Ecoregions of Canada. Can. J. Anim. Sci. 90: 145Á158. The swine industry in Canada has undergone rapid growth in some areas, but has also been restricted by a variety of environmental issues. Ammonia (NH 3 ) emissions are seldom mentioned among these issues, but emissions do occur and atmospheric NH 3 causes a number of impacts including contributing to odour, deposition into sensitive ecosystems and formation of secondary particulate matter, which is a health concern in some regions of North America. This paper describes a new model to estimate NH 3 emissions from the swine sector, relying heavily on a recent survey of swine producers to determine the present N and manure management practices. The key hypothesis was that NH 3 emission rates vary across Ecoregions and over time in a way that affects the degree of impact. The survey showed many differences across Ecoregions, most importantly related to feed crude protein and landspreading practices. The model estimated that grower pigs (!20 kg to market size) excreted on average about 8.5 kg total ammoniacal N (TAN) per (occupied) pig-place per year, and based on the national average farm practices, 25% of this TAN was emitted from barns, 5.3% was emitted from manure storage, and 17% was emitted during landspreading for a total of 4.8 kg NH 3 pig-place(1 yr (1 . The total loss for grower pigs ranged from 40 to 53% of excreted TAN across the 12 Ecoregions. Nursing sows emitted over twice as much per pig. Regions varied in reliance on homegrown feeds, which affected crude protein feeding and TAN excretion rates. Western regions had relatively low emissions from land application of slurry because of more extensive use of injectors. Emissions from grower pigs in winter were about 0.2 kg NH 3 pig-place(1 month(1 , mostly from barns, to as high as 0.7 kg NH 3 pig-place (1 month (1 in May, mostly from landspreading. Total emission for all of Canada in 2006 was 73 )10 6 kg NH 3 or about 13% of agricultural emissions in Canada. The results indicate that emission reductions can be achieved with greater use of low-emission application methods and reduced crude protein in feed. The emissions model can be used in future to assess the impacts from changes in feeding regimes and barn designs, and changes in practices such as animal density and increased access to outdoor spaces.Key words: Swine, ammonia, nitrogen, manure, emissions Sheppard, S. C., Bittman, S., Swift, M.L. et Tait, J. 2010. É tude et mode´lisation des pratiques d'e´levage en vue d'estimer les e´missions mensuelles de NH 3 re´sultant de la production porcine dans 12 e´core´gions du Canada. Can. J. Anim. Sci. 90: 145Á158. L'e´levage porcin a connu une expansion rapide dans certaines re´gions du Canada, tout en subissant les contraintes associe´es a`divers proble`mes environnementaux. Les e´missions d'ammoniac (NH 3 ) font rarement partie de ces contraintes, meˆme si elles existent et meˆme si le NH 3 pre´...

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