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首页> 外文期刊>Tropical Animal Health and Production >Enteric methane emissions of grazing short-horn zebu weaner bulls vary with estimation method and level of crude protein supplementation
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Enteric methane emissions of grazing short-horn zebu weaner bulls vary with estimation method and level of crude protein supplementation

机译：肠道甲烷排放放牧短喇叭Zebu断奶公牛的估算方法和粗蛋白质补充水平

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Low nutrient intake of short-horn zebu (SHZ) cattle raised under extensive grazing systems results in delayed attainment of mature market weights and consequently increased methane production over time. The purpose of this study was to evaluate and compare the effect of providing grazing SHZ weaner bulls with a supplement varying in crude protein on methane emission using the Intergovernmental Panel on Climate Change (IPCC) Tier 2 and a modified Tier 3 approaches. Weaner bulls were allocated to four treatments: grazing only (GZ), grazing plus a supplement containing either 90 (GZS_90), 110 (GZS_110), or 130 g CP/kg DM (GZS_130). Across treatments, monthly CH4 emissions increased with time. Based on the IPCC Tier 2 method, the highest CH4 production from cattle was estimated from weaner bulls on GZ, while the Tier 3 estimated the highest CH4 production to be from cattle on GZS_130. Although the Tier 2 approach showed no significant difference between treatments, the Tier 3 showed that weaner bulls raised under GZS_130 had the highest production of methane as percentage of gross energy intake. Irrespective of method, weaner bulls on GZ produced more (P < 0.001) CH4 per kilogram live weight gain than supplemented cattle. Compared with Tier 3, the Tier 2 estimated 22.9% higher CH4 per kilogram live weight gain for weaner bulls on GZ. These data suggest that supplementing SHZ weaner bulls with a supplement containing110 g CP/kg DM reduces methane emission per kilogram of live weight gain by 30.7%.
机译：在广泛的放牧系统下延长的短喇叭Zebu（SHZ）牛的低营养摄入量导致成熟市场重量延迟获得，因此随着时间的推移增加甲烷产量。本研究的目的是评估和比较使用政府间气候变化（IPCC）第2层和改进的一级方法的甲烷排放对甲烷排放的补充在甲烷排放中不同的补充蛋白质的效果。断奶公牛被分配到四个治疗方法：仅放牧（GZ），放牧加上包含90（GZS_90），110（GZS_110）或130g CP / kg DM（GZS_130）的补充剂。在治疗中，每月CH4排放随时间而增加。基于IPCC第2层方法，从GZ上的断奶公牛估计牛的最高CH4生产，而第3层估计最高的CH4生产是从GZS_130上的牛。虽然Tier 2方法在治疗之间没有显着差异，但是第3层显示，在GZS_130下提出的断奶公牛具有最高产量的甲烷作为总能量摄入量的百分比。无论方法如何，GZES对GZ的次次BULS产生更多（P <0.001）CH4每千克活体重，而不是补充牛。与第3层相比，第2层估计在GZ上的断奶公牛队每公斤活体重增加为22.9％。这些数据表明，使用含有110g Cp / kg DM的补充补充的SHZ断奶公牛将甲烷排放量降低30.7％。

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