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题名: Seasonal heat production and energy balance of grazing yaks on the Qinghai-Tibetan plateau
作者: Ding, LM(丁路明); Wang, YP; Brosh, A; Chen, JQ; Gibb, MJ; Shang, ZH(尚占环); Guo, XS(郭旭生); Mi, JD; Zhou, JW; Wang, HC; Qiu, Q(邱强); Long, RJ(龙瑞军)
收录类别: SCIE ; BIOSIS
出版日期: 2014-12
刊名: ANIMAL FEED SCIENCE AND TECHNOLOGY
卷号: 198, 页码:83-93
出版者: ELSEVIER
出版地: AMSTERDAM
英文摘要: A study was conducted to measure the energy balance of free-ranging yak during the four annual seasons in order to elucidate the factors constraining energy utilization by grazing yak. The heat production (HP, kJ/day) of grazing non-lactating female yaks was calculated as the product of heart rate (HR, beats/min) and the amount of O-2 delivered to the body at every heartbeat (O2P, mu l), and by the constant value of 20.47 kJ/l of O-2 consumed. Heart rates were recorded continuously over 4 days, using modified heart rate monitors. Individual daily fecal output was measured using Cr2O3 as an external marker. Daily herbage dry matter (DM) intake was calculated from fecal output and digestibility of the forage determined in vitro. The greatest herbage mass was measured in August (496 kg DM/ha), and the least in December and May (208 and 226 kg DM/ha). However, the herbage present in both May and August had higher crude protein contents and lower NDF contents than those sampled in October and December. Daily average HR (beats/min) was greater in summer (August) than during the other three seasons (78 vs. 49-52). The greatest O2P was recorded in May. The highest metabolizable energy intake (MEI) (1120 kJ/kg BW0.75 per day) was measured in August when yaks grazed on lush green forage. HP was higher in August than in October and December (715, 548 and 400 kJ/kg BW0.75 per day, respectively), but did not differ significantly from that measured in May (640 kJ/kg BW0.75 per day). The animals were in positive energy balance only during August (energy retention (ER) = 405 kJ/kg BW0.75 per day). Energy balance did not differ between the other seasons: 111 (October), 91 (December) and 13 (May) kJ/kg BW0.75 per day, respectively. HP and ER were highly correlated with MEI (R-2 = 0.73 and 0.88, respectively). The formulas calculated through the regression of HP and ER on MEI were used to estimate fasting heat production (FHP = 341 kJ/kg BW0.75 per day) and maintenance ME requirements (MEm 545 kJ/kg BW0.75 per day) of the free grazing yaks. The results showed that free-ranging yaks expended much more energy to resist harsh environmental and sward conditions compared with confined yak or cattle and grazing cattle in low land area. (C) 2014 Elsevier B.V. All rights reserved.
关键词: Energy metabolism ; Heart rate ; Tibetan plateau ; Yak
作者部门: [Ding, L. M. ; Wang, Y. P. ; Guo, X. S. ; Mi, J. D. ; Qiu, Q. ; Long, R. J.] Lanzhou Univ, Sch Life Sci, Int Ctr Tibetan Ecosyst Management, State Key Lab Grassland Agroecosyst, Lanzhou 730000, Peoples R China ; [Brosh, A.] Newe Yaar Res Ctr, ARO, Beef Cattle Sect, IL-30095 Ramat Yishay, Israel ; [Chen, J. Q. ; Shang, Z. H. ; Zhou, J. W. ; Wang, H. C.] Lanzhou Univ, Coll Pastoral Agr Sci & Technol, Int Ctr Tibetan Ecosyst Management, State Key Lab Grassland Agroecosyst, Lanzhou 730000, Peoples R China ; [Gibb, M. J.] Inst Grassland & Environm Res, North Wyke EX20 2SB, Devon, England
通讯作者: Ding, LM (reprint author), Lanzhou Univ, Sch Life Sci, Int Ctr Tibetan Ecosyst Management, State Key Lab Grassland Agroecosyst, Lanzhou 730000, Peoples R China.
学科分类: Agriculture
文章类型: Article
所属项目编号: Nonprofit Industry-specific (Agriculture) Research Project [201203007] ; Fundamental Research Funds for the Central Universities [Lzujbky-2014-96] ; Qinghai Province Science and Technology Program [2013N1464] ; National Natural Science Foundation of China [31170378]
所属项目名称: 国家自然科学基金项目 ; 中央高校基本科研业务费专项资金
项目资助者: NSFC ; LZU
语种: 英语
DOI: 10.1016/j.anifeedsci.2014.09.022
ISSN号: 0377-8401
WOS记录号: WOS:000346225100008
BIOSIS记录号: BIOSIS:PREV201500095348
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内容类型: 期刊论文
URI标识: http://ir.lzu.edu.cn/handle/262010/115549
Appears in Collections:生命科学学院_期刊论文

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Recommended Citation:
Ding, LM,Wang, YP,Brosh, A,et al. Seasonal heat production and energy balance of grazing yaks on the Qinghai-Tibetan plateau[J]. ANIMAL FEED SCIENCE AND TECHNOLOGY,2014,198:83-93.
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