Research Considers Effect of Organic Feeding Systems on Organic Dairy Cattle Greenhouse-Gas Emissions
University of Wisconsin research that appeared in the Journal of Dairy Science calculated partial life-cycle assessments on greenhouse-gas emissions from different organic dairy feeds. Researchers found variations in the emissions rate for the different feed combinations studied. The study showed that shifting livestock to diets with more soybeans and less corn could reduce emissions attributed to adding nitrogen fertilizer, but it increased the amount of nitrogen in livestock manure. Using more pasture and less grain had the result of decreasing milk output, which raised the amount of greenhouse emissions per unit of milk produced. On the whole, rations that increased total milk production tended to reduce the amount of emissions per unit of milk.
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