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	A comparative study at two different altitudes with two dietary nutrition levels on rumen fermentation and energy metabolism in Chinese Holstein cows
	Qiao G. H. ; Shao T. ; Yu C. Q. ; Wang X. L. ; Yang X. ; Zhu X. Q. ; Lu Y.
	2013
关键词	altitude nutrition rumen fermentation digestibility Chinese Holstein cows fasting heat-production dairy-cows milk-yield glucose-metabolism grazing conditions alpine pasture propionic-acid forage protein concentrate
英文摘要	The object of this study was to investigate the effect of two altitudes (1600 vs. 3600m) with two nutritional levels [5.88MJ/kg dry matter (DM) vs. 7.56MJ/kg DM] on apparent total tract digestibility, rumen fermentation, energy metabolism, milk yield and milk composition in Chinese Holstein cows. Sixteen Chinese Holstein cows in their third lactation with close body weights, days in milk and milk yield were randomly divided into four groups, of which two were directly transferred from Lanzhou (altitude of 1600m) to Lhasa (altitude of 3600m). Four treatments (high plateau and high nutrition level, HA-HN; high plateau and low nutrition level, HA-LN; low plateau and high nutrition level, LA-HN; and low plateau and low nutrition level, LA-LN) were randomly arranged in a 2x2 factorial experimental design. Results indicated that the apparent total tract digestibility of a diet's DM, organic matter, crude protein, neutral detergent fibre and acid detergent fibre and DM intake were not affected by either altitude or nutrition level (p>0.05). Milk protein percentage was higher for the diet with the high level of nutrition than for the diet with low nutrition level irrespective of altitude (p<0.05). Percentages of milk fat and milk lactose were not affected by either altitude or nutrition level (p>0.05). The metabolizable energy used for milk energy output was decreased by high altitude in comparison with that at low altitude (p<0.05). No differences were observed in the live body weight or body condition score (BCS) of Chinese Holstein cows among all of the four treatments (p>0.05).
出处	Journal of Animal Physiology and Animal Nutrition
卷	97
期	5
页	933-941
收录类别	SCI
语种	英语
ISSN号	0931-2439
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/30311]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	Qiao G. H.,Shao T.,Yu C. Q.,et al. A comparative study at two different altitudes with two dietary nutrition levels on rumen fermentation and energy metabolism in Chinese Holstein cows. 2013.

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