The objective of this experiment was to evaluate the impact of feeding biochar in a growing diet on cattle performance, methane (CH4) and carbon dioxide (CO2) emissions. Biochar was sourced from ponderosa pine wood waste (High Plains Biochar, Laramie, WY) and was 83% C with 426 m2/g surface area. Crossbred steers (n = 160; initial BW = 357 kg ± 44 kg) were utilized in a randomized block design (blocked by BW), steers assigned randomly to pen (n = 16), and pens assigned randomly to treatment. Two treatments were evaluated, a control (CON) without biochar (40% wheat straw, 40% corn silage, 15% modified distillers grains, 5% supplement) and the same diet with biochar included at 0.8% of diet dry matter replacing corn in the supplement (CHAR). Four pen replications per treatment were paired within BW block and rotated randomly through an emissions barn with two chambers (each treatment evaluated simultaneously) to capture average weekly CH4 and CO2 production. Pen was experimental unit and chamber was included as a fixed effect for emissions data. There were no statistical differences in performance outcomes between CHAR and CON steers (P ≥ 0.23). Numerically, average daily gain (ADG) was greater (P = 0.46) and dry matter intake (DMI) was lower (P = 0.23) for CHAR steers, resulting in a 2.8% improvement in feed efficiency for CHAR steers (P = 0.25). Emissions of CO2 and CH4 did not statistically differ between treatments (P ≥ 0.22). Numerically, CO2 and CH4 emissions were lower for CON compared to CHAR steers when reported as g per day (3.6% lower) or g per kg of DMI (2.4% lower). Based on the results from this study, there was no indication that feeding biochar, supplemented at 0.8% of diet, reduces GHG emissions in growing steers when compared to negative control.

中文翻译：

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PSIV-7 肉牛生长日粮中添加生物炭对温室气体排放的影响

本实验的目的是评估在生长日粮中饲喂生物炭对牛的生产性能、甲烷 (CH4) 和二氧化碳 (CO2) 排放的影响。Biochar 来自黄松木废料（High Plains Biochar，Laramie，WY），碳含量为 83%，表面积为 426 m2/g。杂交阉牛（n = 160；初始 BW = 357 kg ± 44 kg）用于随机区组设计（被 BW 阻止），随机分配到围栏（n = 16）的公牛，以及随机分配到处理的围栏。对两种处理进行了评估，一个没有生物炭的对照（CON）（40% 小麦秸秆、40% 玉米青贮饲料、15% 改性酒糟、5% 补充剂）和含有 0.8% 日粮干物质的生物炭替代玉米的相同日粮。补充（CHAR）。每个处理的四个笔重复在 BW 块内配对，并随机旋转通过具有两个室的排放谷仓（同时评估每个处理）以捕获平均每周 CH4 和 CO2 产生。笔是实验单元，室作为排放数据的固定效应被包括在内。CHAR 和 CON 转向之间的性能结果没有统计学差异（P ≥ 0.23）。从数值上看，CHAR 肉牛的平均日增重 (ADG) 更高 (P = 0.46)，干物质采食量 (DMI) 更低 (P = 0.23)，导致 CHAR 肉牛的饲料效率提高了 2.8% (P = 0.25) . 处理之间的 CO2 和 CH4 排放没有统计学差异（P ≥ 0.22）。从数值上看，当报告为 g/d（低 3.6%）或 g/kg DMI（低 2.4%）时，CON 的 CO2 和 CH4 排放量低于 CHAR 阉牛。