Methane emissions from yak (Bos grunniens) steers grazing or kept indoors and fed diets with varying forage concentrate ratio during the cold season on the Qinghai-Tibetan Plateau

NWIPB OpenIR

	Methane emissions from yak (Bos grunniens) steers grazing or kept indoors and fed diets with varying forage concentrate ratio during the cold season on the Qinghai-Tibetan Plateau
	Ding, X. Z.1,2; Long, R. J.1,3; Kreuzer, M.4; Mi, J. D.1; Yang, B.5
	2010-12-22
发表期刊	ANIMAL FEED SCIENCE AND TECHNOLOGY
ISSN	0377-8401
卷号	162 期号:3-4 页码:91-98
文章类型	Article
摘要	For national greenhouse gas inventories exact data on all major domesticated livestock systems are required Such data is completely lacking for yak (Bos grunniens) and as this ruminant livestock species seems to have digestion and metabolism which differs from cattle making data extrapolations from cattle are potentially inaccurate In the present study methane (CH(4)) emissions from yak were estimated under grazing and indoor feeding conditions in the cold season on the Qinghai-Tibetan Plateau at >3200m above sea level Twelve 3 year old growing yak steers (175 +/- 10 7 kg) were subjected to measurements of CH(4) output using the sulfur hexafluoride tracer gas technique nutrient intake and apparent digestibilities The first group of three yaks grazed on native winter alpine meadows while the indoor groups were fed either oat hay or total mixed diets of oat hay and concentrate in ratios of 0 6 04 and 04 06 respectively on a dry matter (DM) basis The experimental period lasted for 6 weeks with the first 5 weeks for adaptation and the last for measurement The oat hay contained slightly more crude protein (CP) and less fiber compared to the winter pasture grass while inclusion of concentrate increased the CP intake of the yaks considerably Yaks fed indoors gained body weight (BW) during the experimental period (about 200 g/day and slightly higher with concentrate) while grazing yaks lost 550 g/day of BW Daily CH(4) emissions of the grazing yaks were 81 4 g/day or 1 68 g/kg BW(0 75) at an estimated daily grass DM intake of 3 78 kg Absolute levels of CH(4) emissions were slightly higher in the oat hay fed yaks Compared to the oat hay treatment CH(4) production declined by 03 and 04 with forage concentrate ratios of 6 04 and 04 06 respectively Overall the average proportion of gross energy lost as CH(4) energy (kJ/MJ) was 54 +/- 15 2 These values are the CH(4) emission factors (according to Tier 1 of IPCC 2006) of about 28 kg/year for grazing non-lactating yaks weighing 175 kg When adjusted to metabolic BW yaks were at the lower range of CH(4) emission compared to cattle while they were average when CH(4) was related to DM and gross energy intake Implementing proper grazing management practices to improve winter diet quality and quantity and thus animal productivity can be expected to substantially mitigate CH(4) emissions per unit of meat and milk produced by yak (C) 2010 Elsevier BV All rights reserved; For national greenhouse gas inventories exact data on all major domesticated livestock systems are required Such data is completely lacking for yak (Bos grunniens) and as this ruminant livestock species seems to have digestion and metabolism which differs from cattle making data extrapolations from cattle are potentially inaccurate In the present study methane (CH(4)) emissions from yak were estimated under grazing and indoor feeding conditions in the cold season on the Qinghai-Tibetan Plateau at >3200m above sea level Twelve 3 year old growing yak steers (175 +/- 10 7 kg) were subjected to measurements of CH(4) output using the sulfur hexafluoride tracer gas technique nutrient intake and apparent digestibilities The first group of three yaks grazed on native winter alpine meadows while the indoor groups were fed either oat hay or total mixed diets of oat hay and concentrate in ratios of 0 6 04 and 04 06 respectively on a dry matter (DM) basis The experimental period lasted for 6 weeks with the first 5 weeks for adaptation and the last for measurement The oat hay contained slightly more crude protein (CP) and less fiber compared to the winter pasture grass while inclusion of concentrate increased the CP intake of the yaks considerably Yaks fed indoors gained body weight (BW) during the experimental period (about 200 g/day and slightly higher with concentrate) while grazing yaks lost 550 g/day of BW Daily CH(4) emissions of the grazing yaks were 81 4 g/day or 1 68 g/kg BW(0 75) at an estimated daily grass DM intake of 3 78 kg Absolute levels of CH(4) emissions were slightly higher in the oat hay fed yaks Compared to the oat hay treatment CH(4) production declined by 03 and 04 with forage concentrate ratios of 6 04 and 04 06 respectively Overall the average proportion of gross energy lost as CH(4) energy (kJ/MJ) was 54 +/- 15 2 These values are the CH(4) emission factors (according to Tier 1 of IPCC 2006) of about 28 kg/year for grazing non-lactating yaks weighing 175 kg When adjusted to metabolic BW yaks were at the lower range of CH(4) emission compared to cattle while they were average when CH(4) was related to DM and gross energy intake Implementing proper grazing management practices to improve winter diet quality and quantity and thus animal productivity can be expected to substantially mitigate CH(4) emissions per unit of meat and milk produced by yak (C) 2010 Elsevier BV All rights reserved
关键词	Methane Yak Roughage Proportion Digestibility
WOS标题词	Science & Technology ; Life Sciences & Biomedicine
关键词[WOS]	PURINE DERIVATIVE EXCRETION ; DAIRY-COWS ; NEW-ZEALAND ; MILK-PRODUCTION ; CATTLE ; SUPPLEMENTATION ; DIGESTIBILITY ; CORN ; DIGESTION ; LIVESTOCK
收录类别	SCI
语种	英语
WOS研究方向	Agriculture
WOS类目	Agriculture, Dairy & Animal Science
WOS记录号	WOS:000285672500003
引用统计	被引频次：38[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://210.75.249.4/handle/363003/1614
专题	中国科学院西北高原生物研究所
作者单位	1.Lanzhou Univ, Int Ctr Tibetan Plateau Ecosyst Management, Lanzhou 730000, Peoples R China 2.Chinese Acad Sci, NW Inst Plateau Biol, Xining, Peoples R China 3.Lanzhou Univ, Sch Pastoral Agr & Technol, Lanzhou 730000, Peoples R China 4.ETH, Inst Plant Anim & Agroecosytem Sci, CH-8092 Zurich, Switzerland 5.Gansu Agr Univ, Coll Anim Sci & Technol, Lanzhou, Peoples R China
推荐引用方式 GB/T 7714	Ding, X. Z.,Long, R. J.,Kreuzer, M.,et al. Methane emissions from yak (Bos grunniens) steers grazing or kept indoors and fed diets with varying forage concentrate ratio during the cold season on the Qinghai-Tibetan Plateau[J]. ANIMAL FEED SCIENCE AND TECHNOLOGY,2010,162(3-4):91-98.
APA	Ding, X. Z.,Long, R. J.,Kreuzer, M.,Mi, J. D.,&Yang, B..(2010).Methane emissions from yak (Bos grunniens) steers grazing or kept indoors and fed diets with varying forage concentrate ratio during the cold season on the Qinghai-Tibetan Plateau.ANIMAL FEED SCIENCE AND TECHNOLOGY,162(3-4),91-98.
MLA	Ding, X. Z.,et al."Methane emissions from yak (Bos grunniens) steers grazing or kept indoors and fed diets with varying forage concentrate ratio during the cold season on the Qinghai-Tibetan Plateau".ANIMAL FEED SCIENCE AND TECHNOLOGY 162.3-4(2010):91-98.