The seasonal nutritional dynamics of major forages composition of the steppe of Bahrain Right Banner and its forming structure of the saturated chain alkane research

doi:10.11686/cyxb2019067

Abstract

Abstract: Seven conventional nutrient analyses were conducted monthly for 10 forage species in the typical steppe grassland of Bahrain Right Banner from May to the following January, and concentrations of 8 saturated chain alkane compounds from eight of the forage species were measured in July and October, to study the seasonal changes in grassland feed quality. It was found that across the May-January period studied, crude protein (CP) content decreased significantly (P<0.05) quarter by quarter, in most of the species measured. The calcium content peaked (P<0.01) in October, and total P (TP) content was highest (P<0.01) in May. The acid detergent fiber (ADF) content was highly correlated with the neutral detergent fiber content (NDF) (P<0.01), while Ca content displayed an extremely negative correlation with TP content (P<0.01). In July and October, the concentrations of C₂₉ and C₃₁ saturated chain alkanes were much higher (P<0.01) in most grass samples, than the other six saturated chain alkanes measured. On principal component analysis of the data, Z₁ and Z₂ which were the principal component scores reflecting the saturated chain alkane composition were significantly different (P<0.05). For the major forage species in the steppe grassland of Bahrain Right Banner, the above data showed that supplementary feeding would be required by livestock as the CP decreased in late season, seasonal trends in herbage calcium and phosphorus contents were opposite, and the nutritional value of herbage for grazing livestock could also be estimated by the paraffin determinations as the contents of the various saturated chain alkanes in these forages showed seasonal variation parallel to that of the nutritional parameters.

Key words: steppe, nutritional ingredient, saturated chain alkane, correlation, principal component analysis

LI Bao-dong, DENG Yu, SUN Hai-zhou, ZHAO Rui-xia, SA Qi-reng-gui, LI Xiao-yan, HONG Min, SANG Dan, ZHANG Chun-hua, REN Xiao-ping. The seasonal nutritional dynamics of major forages composition of the steppe of Bahrain Right Banner and its forming structure of the saturated chain alkane research[J]. Acta Prataculturae Sinica, 2019, 28(12): 159-168.

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