The nitrogen (N) excreted by grazing animals is the main source of nitrous oxide (N₂O) emissions in livestock systems, and feeding strategies to mitigate N excretion should be further studied. The objective of this study was to evaluate the effects of ground corn and tannin extract supplementation on mitigating N₂O emissions from sheep excreta. The emissions factor (EF,% of N excreted, which was emitted as N₂ON) under the studied conditions were also measured. Two experiments were conducted. In the first one, six Lacaune lambs, with an average BW of 27 ± 3 kg, were distributed in a replicated 3 × 3 Latin square experimental design. The treatments included ad libitum access to ryegrass (Lolium multiflorum Lam.) silage, which contained 21.1 g N/kg DM and was supplemented with 60 g of soybean meal (S), 140 g of ground corn + 60 g of soybean meal (SC) or 140 g of ground corn + 60 g of soybean meal + 40 g/kg Acacia mearnsii tannin extract concentrate (SCT). The daily production of faeces and urine was measured, and samples were collected each day. In the second experiment, urine and faeces were applied to static chambers in the field to determine their N₂O emissions. Three replicates of type of excreta from each treatment were included. The nitrogen intake was similar between the treatments, with an average of 18 g/day. The faecal N excretion obtained with tannin extract supplementation was 16% higher (P < 0.01) than that obtained with the S and SC treatments. The daily urinary N excretion from the animals administered ground corn supplementation was 12% lower (P < 0.05) than that from the animals that received only soybean meal, whereas the inclusion of tannins did not effectively induce further decreases in urinary N excretion. The faecal EF of the different treatments was similar, with an average of 0.56 g N₂ON/100 g N. The EF of the urine samples averaged 4.8 g N₂ON/100 g N. Corn grain supplementation decreased urinary N excretion and N₂O emissions from sheep excreta, whereas Acacia mearnsii tannin extract did not effectively improve this response.

放牧动物排出的氮（N）是牲畜系统中一氧化二氮（N ₂ O）排放的主要来源，应进一步研究减轻氮排泄的喂养策略。这项研究的目的是评估补充玉米和单宁提取物对减轻绵羊粪便中N ₂ O排放的影响。还测量了研究条件下的排放因子（EF，排泄的N的百分比，以N ₂ O N的形式排放）。进行了两个实验。在第一个中，六只Lacaune羔羊平均体重为27±3千克，分布在重复的3×3拉丁方实验设计中。治疗包括随意进入黑麦草（黑麦草）。青贮饲料，其中含有21.1 g N / kg DM，并补充有60 g豆粕（S），140 g玉米粉+ 60 g大豆粉（SC）或140 g玉米粉+ 60 g玉米粉豆粕+ 40克/千克相思木单宁提取物浓缩物（SCT）。测量每天的粪便和尿液产量，并每天收集样品。在第二个实验中，将尿液和粪便应用于田间的静态隔间，以确定它们的N ₂ O排放量。包括每种处理的三种排泄物类型。两次处理之间的氮摄入量相似，平均为18克/天。补充单宁提取物获得的粪便N排泄量增加了16％（P<0.01），比S和SC处理的结果要好。补充玉米粉的动物的每日尿N排泄量比仅接受豆粕的动物的尿中N排泄量低12％（P <0.05），而单宁的添加并不能有效地引起尿N排泄量的进一步降低。不同处理的粪便EF相似，平均为0.56 g N ₂ O N / 100 gN。尿液样品的EF平均为4.8 g N ₂ O N / 100 gN。补充玉米粒减少了尿N的排泄。和羊排泄物中的N ₂ O排放，而金合欢草单宁提取物不能有效地改善这种反应。