The effect of dietary addition of nitrate or increase in lipid concentrations, alone or in combination, on performance and methane emissions of beef cattle
The effect of dietary addition of nitrate or increase in lipid concentrations, alone or in combination, on performance and methane emissions of beef cattle
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DOI：
10.1017/s175173111700146x
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发表时间：
2018-02-01
期刊：
影响因子：
3.6
通讯作者：
Rooke, J. A.
中科院分区：
文献类型：
--
作者：
Duthie, C. -A.;Troy, S. M.;Rooke, J. A.
在饮食中添加硝酸盐或增加脂肪浓度是减少肠道甲烷(CH4)排放的既定策略，但它们联合使用时的有效性在很大程度上尚未被探索。本试验研究了日粮硝酸盐和添加脂肪单独或同时添加对肥育肉牛CH4排放和生产性能的影响。试验采用2×4析因设计，包括两个品种(杂交安格斯黄牛(AAX)和杂交利木赞牛(LIMx))和四个饲粮处理(每个处理基于550克饲料：450克精料/千克干物质(DM))。4个日粮处理按2×2析因设计进行分配，其中对照处理以菜籽粕为主要蛋白质来源，用硝酸盐(21.5g硝酸盐/kg DM)、玉米酒糟(MDDG，将日粮粗脂肪从24 g/kg DM增加到37 g/kg DM)或同时用硝酸盐和MDDG代替。将20头公牛(n=20头/日粮处理)分配到四个处理中的每一个品种，每个品种的数量相等，随机提供饲料。在适应饲料处理28天后，记录了56天的个体动物采食量、生产性能和饲料效率。此后，在13周内测量甲烷排放量(每周6头牛)。增加饲料中的脂肪不会对动物的生产性能产生不利影响，也不会与饲料中的硝酸盐产生交互作用。相比之下，在日粮中添加硝酸盐会导致较差的增重(P
Adding nitrate to or increasing the concentration of lipid in the diet are established strategies for reducing enteric methane (CH4) emissions, but their effectiveness when used in combination has been largely unexplored. This study investigated the effect of dietary nitrate and increased lipid included alone or together on CH4 emissions and performance traits of finishing beef cattle. The experiment was a 2x4 factorial design comprising two breeds (cross-bred Aberdeen Angus (AAx) and cross-bred Limousin (LIMx) steers) and four dietary treatments (each based on 550 g forage : 450 g concentrate/kg dry matter (DM)). The four dietary treatments were assigned according to a 2x2 factorial design where the control treatment contained rapeseed meal as the main protein source, which was replaced either with nitrate (21.5 g nitrate/kg DM); maize distillers dark grains (MDDG, which increased diet ether extract from 24 to 37 g/kg DM) or both nitrate and MDDG. Steers (n=20/dietary treatment) were allocated to each of the four treatments in equal numbers of each breed with feed offered ad libitum. After 28 days adaptation to dietary treatments, individual animal intake, performance and feed efficiency were recorded for 56 days. Thereafter, CH4 emissions were measured over 13 weeks (six steers/week). Increasing dietary lipid did not adversely affect animal performance and showed no interactions with dietary nitrate. In contrast, addition of nitrate to diets resulted in poorer live-weight gain (P