The Seasons Change And ComPrehensive Evaluation Of Different Forage’s Nutrient On Natural Grassland

The natural grassland vegetations of Shaertao Mountain were abundant which reserved rich forage resources, which occupied the important position and provided the diet for grazing animal. In the present study, there are many parts about 19 kinds of forages of Shaertao Mountain:(1) Using the Win TWINS and DCA methods of CANOCO data sequence the seasons change of 11 nutritional kinds of parameters of 19 kinds of forage grasses, analysis the impact of environmental factors and compositions of vegetation forage to the season dynamic changes of forage grass’ s nutrient.(2) Analysis 11 nutritional kinds of parameters of 19 kinds of forages: CP, CF, Ash, Ca, P, NDF, ADF, EE, DM, NFC and GE, compare different forage nutritional quality in the same season.(3)Using the DPS and membership function analysis 11 nutritional kinds of parameters of 19 kinds of forage grasses, assess the nutritional value of membership function’s average, the higher the average of the greater of the nutritional value;(4) Using gas production technique in sheep par the feeding value of 19 kinds of forages. The main results are shown as follows:(1)The CP、Ash、NDF、ADF、Ca and P of the legume forages, Kobresia ca Pillifolia, Sanguisorba al Pina, Alchemilla sibirica, Carex tristachya, Iris ruthenica, Artemisia dracunculu and Geranium Pratense were wides Pread higher than the gramineous.The EE of the gramineous, Kobresia ca Pillifolia, Sanguisorba al Pina, Alchemilla sibirica,Carex tristachya, Iris ruthenica,Artemisia dracunculu and Geranium Pratense were widespread higher than legume forages.(2)The results of membership function analysis are shown as follows:The nutritional quality of the natural grassland vegetations of Artemisia dracunculu and Geranium Pratense is better than the gramineous at vegetative period on June.The nutritional quality of the subalpine meadows forage Alchemilla sibirica and Sanguisorba al Pina is better than the legume forages at the flowering stage on July. The legume forages is better than the gramineous.The nutritional quality of the legume forages is better than the subalpine meadows forage and the gramineous in grain filling stage on August. The nutritional quality the gramineous of Stipa ca Pillata is best, Agrostis gigantea is the worst after the fruit vegetative period on September and at stop growth phase on October. The nutritional quality the gramineous of Iris ruthenica is best, R. abolinii var.divaricans is the worst at withering stage on November.(3)Using the DCA methods analysis obtained the seasons change of different forage grass’ s nutrient was not only related to the function physiological characteristics and nature of pasture itself but also compositions of vegetation forage of the environment. The dynamic trend of DCA ordination diagram of 11 nutritional kinds of parameters corresponding to grassland types, compositions of vegetation forage, ecological moisture typed and altitude.(4)Using gas production technique par the feeding value of 19 kinds of forages. The results were shown that: The gas changing trends of the gramineous is basically consistent. The gas production in vitro fermentation of gramineous pasture is increase over time. The gas changing trends is steeper in 12-48 h training period. Gas production rate is higher than in other periods.The gas changing trends is gently before 12 h. The gramineous of the gas production is decreasing with the continuation of the growth period apart from Bromus inermis. The gas changing trends of the legume forages is basically consistent apart from Trifolium lumpinaster. The gas changing trends is steeper in 0-12 h training period of Trifolium lumpinaster M, falcate var, Romanica Tr, pratense, Oxytropis merkensis. The gas changing trends is no obvious rule of the other forages due to the large difference between the pasture families and genera. Calculated OMD and ME by pasture forage gas production.The larger gas production the greater OMD and ME. Measured the OMD is between 25.16-84.45 %. ME is between 2.44-12.27 MJ/kg. Evaluation of pasture digestibility in vitro of sheep by OMD and ME. Pasture digestibility is no significant difference at vegetative period on June. The legume forages and the other forages were significantly higher than the gramineous apart from M. falcate var. Romanica, Trifolium lumpinaster, and Artemisia dracunculu at the flowering stage on July. The OMD is between 31.47 %-67.93 % in grain filling stage on August. Apart from M. falcate var. Romanica the legume forages were significantly higher than Stipa capillata Achnatherum splendens Bromus inermis R. abolinii var.divaricans of the gramineous.Dactylis glomerata of the gramineous is maximum levels, Stipa capillata is Minimum from the fruit vegetative period on September to the withering stage on November.