Manure has become a minor source of nitrogen in all major agricultural countries.

在主要的农业国家动物粪便已经不是氮肥的主要来源。

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This is largely because of reductions in fertiliser use and the amount of nitrogen leaching from manure.

这是相当大的一部分，因为可以减少施肥和从动物粪便中滤出的氮。

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Excess nitrogen and phosphorus nutrients due to large quantities of feed imports, can lead to problems with manure disposal and pose a potential pollution risk.

大量的饲料进口产生过多的氮磷营养物，将导致粪便处理的问题，并构成潜在的污染风险。

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That is mostly produced by the nitrogen in pig manure, and the team of scientists said they might one day be able to tackle that problem too.

BBC: GM pigs to produce cleaner manure