期刊
ANIMAL FEED SCIENCE AND TECHNOLOGY
卷 173, 期 3-4, 页码 186-193出版社
ELSEVIER
DOI: 10.1016/j.anifeedsci.2012.01.011
关键词
Nutritive value; Fatty acids; High altitude stress; Alpine herbage; Tibetan Plateau
资金
- National Natural Science Foundation of China [30800800, 31170378]
- Basic Research Foundation for Central Government University of Lanzhou University [Izujbky-2009-46]
Relationships between changes of chemical composition of Kobresia littledalei growing at different altitudinal gradients on alpine meadows of the Tibetan Plateau and its nutritive values to local herbivores were investigated. Fresh herbages were sampled from altitudes of 3980, 4582 and 5100 m. Changes (P<0.05) in concentrations of malondialdehyde, chlorophyll and carotenoids in the fresh K. littledalei occurred due to growth altitude. Metabolic changes and physiological processes in the grass to the cooler environment at high altitudes resulted in increases (P<0.05) of its crude protein, amino acid, total lipid, soluble carbohydrate, protein fractions of A, B-1, B-2 (according to the Cornell Net Carbohydrate and Protein System), alpha-linolenic acid concentrations as well as in vitro dry matter digestibility by the herbivores, and decreases (P<0.05) in neutral and acid detergent fibers, lignin(sa), and some fatty acids (i.e.. palmitinic, palmitoleic, stearic, oleic, linoleic acids). Physiological adaptation of K. littledalei to the harsh environment of higher altitudes results in pronounced changes of its chemical components which confers a higher nutritive value to local herbivores. (C) 2012 Elsevier B.V. All rights reserved.
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