Organisation for Economic Co-Operation and Development's Agriculture, Trade and the Environment: The Pig Sector PDF

By Organisation for Economic Co-Operation and Development

ISBN-10: 926410416X

ISBN-13: 9789264104167

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Additional resources for Agriculture, Trade and the Environment: The Pig Sector (Agriculture, Trade and the Environment)

Example text

Countries are listed within each grouping according to their 1995-97 nitrogen balances. htm. Changes in the OECD nitrogen soil balance indicator between 1985-87 and 1995-97 reveal different trends in the potential risk to water pollution from nitrogen in pig manure. Again, four groupings of OECD countries can be identified. 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.

Pig housing units generate dust and micro-organisms, of particular concern to those working in these units and people living in the vicinity of pig farms. However, as with pathogens released into water from pig manure little is known about the fate and transport of dust and micro-organisms into the environment from pig housing. Odours are an important environmental nuisance to those living close to pig production units, although hydrogen sulphide (an odour-causing compound) is known to lead to human health problems in high enough concentrations (USEPA, 1999a).

1. Ranges of biochemical oxygen demand concentrations from various wastes Waste Source BOD Value (mg/l) Silage effluents Pig slurry Cattle slurry Liquid effluents draining from slurry stores Treated domestic sewage Clean river water 30 000 – 80 000 20 000 – 30 000 10 000 – 20 000 1 000 – 12 000 20 – 60 <5 Source: MAFF (1998). g. bacterial, parasites, and medicines) which can also be transmitted in waterways (and the air) directly from faecal discharges and leaking slurry/manure stores, and from field application of pig manure.

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Agriculture, Trade and the Environment: The Pig Sector (Agriculture, Trade and the Environment) by Organisation for Economic Co-Operation and Development


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