RUMINANT AND HERBIVORE NUTRITION AND FEED

Comparative Study on Nutritive Value of Kobresia tibetica of Alpine Meadow in Dangxiong and Naqu regions of Qinghai-Tibet Plateau

  • BAO Yuhong ,
  • WANG Wenbo ,
  • YUAN Xianjun ,
  • Pubuzhuoma ,
  • LUO Zeng ,
  • CAN Muyou
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  • 1. State Key Laboratory of Germplasm Resources and Genetic Improvement of Tibetan Barley and Yak, Lhasa 850000, China;
    2. Institute of Grass Science, Tibet Academy of Agriculture and Animal Husbandry Sciences, Lhasa 850000, China;
    3. Institute of Ensiling and Processing of Grass, College of Prataculture Science, Nanjing Agricultural University, Nanjing 210095, China

Received date: 2021-04-20

  Online published: 2021-11-10

Supported by

 

Abstract

This study was conducted to compare the nutritive value of Kobresia tibetica of alpine meadow in Dangxiong and Naqu regions of Qinghai-Tibet Plateau. The Kobresia tibetans grown in alpine meadow of Dangxiong (4 200 m above sea level) and Naqu regions (4 450 m above sea level) in August and November were collected, then the nutrient composition and in vitro digestibility of Kobresia tibetans were analyzed. The results showed as follows:1) the content of ether extract (EE) of Kobresia tibetica in two regions in November was significantly lower than that in August (P<0.05). The proportions of non-structural carbohydrates (CNSC) and sugars (CA) of Kobresia tibetica in Dangxiong region were significantly lower than those in Naqu region (P<0.05), and the proportions of CNSC and CA of Kobresia tibetica in two regions in August was significantly higher than that in November (P<0.05). The content of crude protein (CP) of Kobresia tibetica in two regions in August was significantly higher than that in November (P<0.05). The proportion of non-protein nitrogen (PA) of Kobresia tibetica in two regions in August was significantly higher than that in November (P<0.05), and the proportion of PA of Kobresia tibetica in Naqu region was significantly higher than that in Dangxiong region (P<0.05). 2) There was no significant difference in the in vitro organic matter digestibility (IVOMD) of Kobresia tibetica between two areas in August (P>0.05), the IVOMD of Kobresia tibetica in Dangxiong region in November was significantly lower than that in Naqu region (P<0.05), and the IVOMD of Kobresia tibetica in Dangxiong region in November was significantly lower than that in August (P<0.05). There was no significant difference in the metabolizable energy (ME) of Kobresia tibetica between two regions in August (P>0.05), the ME of Kobresia tibetica in two regions in November was significantly lower than that in August (P<0.05), and the ME of Kobresia tibetica in Naqu region in November was significantly higher than that in Dangxiong region (P<0.05). The rumen fluid ammonia nitrogen/total nitrogen (NH3-N/TN) of Kobresia tibetica in two regions in August was significantly lower than that in November (P<0.05). There was no significant difference in the rumen fluid acetic acid content of Kobresia tibetica between two areas in August (P>0.05), and the rumen fluid acetic acid content of Kobresia tibetica in November was significantly lower than that in August (P<0.05); the rumen fluid acetic acid content of Kobresia tibetica in Naqu region in November was significantly higher than that in Dangxiong region (P<0.05). There was no significant difference in the rumen fluid propionic acid content of Kobresia tibetica between two regions in August (P>0.05), and the rumen fluid propionic acid content of Kobresia tibetica in November was significantly lower than that in August (P<0.05); the rumen fluid propionic acid content of Kobresia tibetica in Naqu region in November was significantly higher than that in Dangxiong region (P<0.05). In conclusion, the growth region and time can affect the nutritive value and in vitro digestibility of Kobresia Tibetans, the CNSC and CA proportions and IVDMD, IVOMD and ME of Kobresia tibetica in August are higher than those in November, and the proportions of CNSC and PA of Kobresia tibetica in Naqu region are always higher than those in Dangxiong region.

Cite this article

BAO Yuhong , WANG Wenbo , YUAN Xianjun , Pubuzhuoma , LUO Zeng , CAN Muyou . Comparative Study on Nutritive Value of Kobresia tibetica of Alpine Meadow in Dangxiong and Naqu regions of Qinghai-Tibet Plateau[J]. Chinese Journal of Animal Nutrition, 2021 , 33(11) : 6233 -6244 . DOI: 10.3969/j.issn.1006-267x.2021.11.024

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