Nutritional quality of four important herbage species in summer grazing grassland in the alpine zone, west Tianshan Mountain

doi:10.11686/cyxb2016389

Abstract

Abstract: The aim of this study was to evaluate the nutritional quality of four important herbage species growing in summer alpine pasture in the western region of Tianshan Mountain. We determined the nutritive value, digestibility, and parameters of in vitro gas production for four typical herbages (Kobresia capillifolia, Carex stenocarpa, Alchemilla sibirica, and Sanguisorbs alpina) growing in summer pasture on Shaertao mountain (2800-3400 m above sea level), west Tianshan. The contents of crude fiber and crude fat did not differ significantly among the four herbage species (P>0.05). C. lasiocarpa had the highest contents of acid detergent fiber (P=0.048) and neutral detergent fiber (P=0.005). A. sibirica had the highest content of crude ash (P=0.037) and the longest delay time (P=0.005). S. alpina had the highest contents of crude protein (P<0.0001), calcium (P=0.001), and phosphorus (P=0.004), the most digestible organic matter (P=0.003), and the highest metabolic energy (P=0.067) and gas production rate (P=0.079). K. capillifolia had the highest dry matter content (P=0.001). The results of a principal component analysis based on the 14 main indexes of nutritional quality indicated that the four herbages were ranked, from highest nutritional value to lowest, as follows: S. alpine>A. sibirica>K. capillifolia>C. stenocarpa.

ZHANG Fan-Fan, HE Hai-Xiu, YU Lei, LU Wei-Hua, ZHANG Qian-Bing, MA Chun-Hui. Nutritional quality of four important herbage species in summer grazing grassland in the alpine zone, west Tianshan Mountain[J]. Acta Prataculturae Sinica, 2017, 26(8): 207-215.

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