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在美国养猪业结构变化中，小规模的养猪者不断减少，大规模的不断增加；而且大规模饲养者在提供上市肉猪上占越来越大的比重。环境污染问题也日益受政府、生产和研究部门的关注。猪粪污污染的焦点在于粪污中氮、磷及重金属的含量。对猪场粪污，有的仅贮放后利用，有的处理后利用；处理中不少用人工湿地设施，基本用于农田。粪尿施用不当有可能对地表水和地下水造成污染，重视“环保型”猪日粮配方研究，减少环境污染，是今后猪营养学的任务之一。
In the United States, changes in the structure of the pig industry, small-scale pig farmers continue to decline, large-scale continuous increase; and large-scale farmers in the market to provide an increasing share of pigs. The issue of environmental pollution is also increasingly receiving the attention of the government, production and research departments. The focus of pig manure pollution is the content of nitrogen, phosphorus and heavy metals in manure. Pig farm feces, and some use only after storage, and some use after treatment; processing a lot of artificial wetland facilities, the basic for farmland. Improper excrement management may cause pollution to surface water and groundwater. Emphasis on “green” pig diet formula research and reduction of environmental pollution are one of the tasks of pig nutrition in the future.