This study evaluated potential trade-offs between enteric methane (CH₄) emissions and CH₄ emissions from feces of dairy cows fed grass silage or partial replacement of grass silage with corn silage, both with and without supplementation of rapeseed oil. Measured data for eight dairy cows (two blocks) included in a production trial were analyzed. Dietary treatments were grass silage (GS), GS supplemented with rapeseed oil (GS-RSO), GS plus corn silage (GSCS), and GSCS supplemented with rapeseed oil (GSCS-RSO). Feces samples were collected after each period and incubated for nine weeks to estimate fecal CH₄ emissions. Including RSO (0.5 kg/d) in the diet decreased dry matter intake (DMI) by 1.75 kg/d. Enteric CH₄ emissions were reduced by inclusion of RSO in the diet (on average 473 vs. 607 L/d). In 9-week incubations, there was a trend for lower CH₄ emissions from feces of cows fed diets supplemented with RSO (on average 3.45 L/kg DM) than cows with diets not supplemented with RSO (3.84 L/kg DM). Total CH₄ emissions (enteric + feces, L/d) were significantly lower for the cows fed diets supplemented with RSO. Total fecal CH₄ emissions were similar between treatments, indicating no trade-offs between enteric and fecal CH₄ emissions.

中文翻译：

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补充菜籽油的饲喂草或玉米青贮饲料的奶牛的肠和粪便甲烷排放

这项研究评估了饲喂草青贮饲料或未添加菜籽油的奶牛或用玉米青贮饲料部分替代草青贮饲料的肠道甲烷（CH ₄）排放与粪便中CH ₄排放之间的潜在权衡。分析了生产试验中八头奶牛（两头）的测量数据。饮食处理包括青贮饲料（GS），补充了菜籽油的GS（GS-RSO），GS加玉米青贮饲料（GSCS）和补充了菜籽油的GSCS（GSCS-RSO）。在每个时期之后收集粪便样品，并孵育九周以估计粪便CH ₄排放。在饮食中加入RSO（0.5 kg / d）可使干物质摄入量（DMI）降低1.75 kg / d。肠溶CH ₄通过在饮食中加入RSO减少了排放（平均473比607 L / d）。在为期9周的孵化中，趋势是饲喂添加RSO（平均3.45 L / kg DM）的日粮的奶牛粪便中的CH ₄排放量低于未添加RSO（3.84 L / kg DM）的日粮。饲喂添加RSO的奶牛的总CH ₄排放量（肠+粪便，L / d）显着降低。不同处理之间的粪便CH ₄总排放量相似，表明在肠道和粪便CH ₄排放之间没有权衡。