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Acta Prataculturae Sinica ›› 2014, Vol. 23 ›› Issue (5): 99-106.DOI: 10.11686/cyxb20140511

• Orginal Article • Previous Articles     Next Articles

A comprehensive evaluation of nutritional value of nine shrubs in the karst area of northwest Guizhou

SUN Hong1,YU Ying-wen1,MA Xiang-li2,MU Xiao-ming1,LIAO Jia-fa3   

  1. 1.State Key Laboratory of Grassland Agro-ecosystems, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou 730020, China;
    2.College of Animal Science and Technology, Yunnan Agricultural University, Kunming 650201, China;
    3.Guizhou Plateau Grassland Experimental Station, Weining 553100, China
  • Received:2012-08-21 Online:2014-10-20 Published:2014-10-20

Abstract:

Shrubs are one kind of diet for goats and can provide energy, protein, minerals and multivitamins for grazing animals. Information about the feeding value off wild shrubs is useful to graziers. The mineral element content and nutritional value of nine shrubs in the karst region of northwest Guizhou were quantitatively analyzed and further evaluated using fuzzy membership function, grey correlation degree and cluster analysis methods. The mineral content of the nine shrubs was 0.56%-1.10% for Ca, 0.08%-0.21% for P, 0.26%-0.36% for Na, 0.7%-1.8% for K, 0.25%-1.00% for Mg, 0.03%-0.06% for Fe, 15.2-24.1 mg/kg for Cu, 76.5-114.0 mg/kg for Mn, 33.2-113.1 mg/kg for Zn, respectively. The nutritional value was 7.5%-17.1% for CP (crude protein), 7.8%-13.6% for WSC (water-soluble sugars, excluding of Elaeagnus pungens), 11.2%-26.5% for ADF (acid detergent fiber), 16.2%-45.1% for NDF (neutral detergent fiber), 5.9-7.9 MJ/kg for ME (metabolic energy) and 37.1%-49.4% for OMD (digestibility of organic matter), respectively. The results for mineral elements, for nutritional value and for comprehensive feeding value of nine shrubs were similar for fuzzy membership function value, grey correlation degree and cluster analysis. The ranking for mineral element content of the shrubs was Rubus corchorifolius and Cotoneaster horizontalis>Dendrobenthamia capitata and Salix cathayana>Elaeagnus pungens and Rosa mairei>Hypericum patulum, Buddleja officinalis and Pyracantha fortuneana, while the nutritional values was P. fortuneana>E. pungens>D. capitata>H. patulum, B. officinalis, S. cathayana, R. mairei, R. corchorifolius and C. horizontalis. The results of comprehensive nutritional value and cluster analysis showed that the feeding value of R. corchorifolius and C. horizontalis was excellent, D. capitata, S.cathayana, E. pungen, R. mairei and P. fortuneana was good, and H. patulum and B. officinalis was medium. When evaluating the feeding value of shrubs, their mineral elements, nutritional values, biologically active substances and the preferential feeding behavior of livestock should be considered.

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