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Position: Home > Articles > Could natural phytochemicals be used to reduce nitrogen excretion and excreta-derived N(2)O emissions from ruminants? Journal of Animal Science and Biotechnology 2023,14 (1)

Could natural phytochemicals be used to reduce nitrogen excretion and excreta-derived N(2)O emissions from ruminants?

作者：

Yuxing Zhao;Ming Liu;Linshu Jiang;Leluo Gua

单位：

Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, Canad;Beijing Key Laboratory of Dairy Cow Nutrition, College of Animal Science and Technology, Beijing University of Agriculture, Beijing, China; College of Animal Science and Technology, China Agricultural University, Beijing, China

关键词：

Nitrogen metabolism;Nitrous oxide;Plant bioactive compounds;Ruminant;Urine patche

摘要：

Ruminants play a critical role in our food system by converting plant biomass that humans cannot or choose not to consume into edible high-quality food. However, ruminant excreta is a significant source of nitrous oxide (N(2)O), a potent greenhouse gas with a long-term global warming potential 298 times that of carbon dioxide. Natural phytochemicals or forages containing phytochemicals have shown the potential to improve the efficiency of nitrogen (N) utilization and decrease N(2)O emissions from the excreta of ruminants. Dietary inclusion of tannins can shift more of the excreted N to the feces, alter the urinary N composition and consequently reduce N(2)O emissions from excreta. Essential oils or saponins could inhibit rumen ammonia production and decrease urinary N excretion. In grazed pastures, large amounts of glucosinolates or aucubin can be introduced into pasture soils when animals consume plants rich in these compounds and then excrete them or their metabolites in the urine or feces. If inhibitory compounds are excreted in the urine, they would be directly applied to the urine patch to reduce nitrification and subsequent N(2)O emissions. The phytochemicals' role in sustainable ruminant production is undeniable, but much uncertainty remains. Inconsistency, transient effects, and adverse effects limit the effectiveness of these phytochemicals for reducing N losses. In this review, we will identify some current phytochemicals found in feed that have the potential to manipulate ruminant N excretion or mitigate N(2)O production and deliberate the challenges and opportunities associated with using phytochemicals or forages rich in phytochemicals as dietary strategies for reducing N excretion and excreta-derived N(2)O emissions.

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Could natural phytochemicals be used to reduce nitrogen excretion and excreta-derived N(2)O emissions from ruminants?

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