By Organisation for Economic Co-Operation and Development
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Extra resources for Agriculture, Trade and the Environment: The Pig Sector (Agriculture, Trade and the Environment)
35 x The risk has increased in Ireland, Korea, Spain and the United States, as measured by an increase in both the nitrogen balance and the contribution of pigs to total livestock nitrogen manure production between the two periods. In Canada, while the contribution of pigs to livestock nitrogen manure has fallen marginally, the overall nitrogen balance has increased. In all five countries there has been a significant increase in pigmeat production and in the quantity of pig nitrogen manure. These trends indicate that the expansion of pig production in these five countries is exerting a growing risk to the environment in terms of the potential release of nitrates from pig farming into water bodies.
The pig’s productive cycle has become adapted to the annual acorn harvest from cork oaks, although only 40% of the total Iberian pig population are exclusively fed on acorns, the remainder also receiving concentrate feed supplements to their diet. At present the Iberian pigs accounts for less than 10% of the total Spanish pig herd. Pigs are also used to harvest for black truffles (edible fungi) in the natural oak woods of Perigord, France (Hall, 1993). 5). For example, odour and dust emissions from pig operations are a public nuisance and health problem at the local level, while the greenhouse gases produced by pigs are a global concern related to climate change.
Straw, deep litter); and temperature and ventilation control in the housing. Improved ventilation systems can also provide benefits in reducing dust and odours important to workers in piggeries and local people living close to these operations. 5). 5. 73 Housing System Note: 1. Low emission systems include a variety of methods, for example, manure flushing, scraping and cooling. Source: OECD Secretariat, adapted from Hartung (2001) and Monteny (2001). While there are a range of different manure storage systems, for most OECD countries manure is separated from pigs by slatted floors or open channels, and the slurry stored as a liquid in storage tanks (Bos and de Wit, 1996).