| The study carried out in the subtropical typical inflorescences ryegrass-white clover mixedartificial grassland, belonged to Yunnan goat breeding center. The experiment animal is local variety,yunling black goat. Stocking rate divided into two levels, highgrazing capacity group,expressed as H,is14units/hm2, low grazing capacity group, expressed as L is9unit/hm2, grazing treatment are four, suchas H-H; H-L; L-H; L-L. Through the analysis of1, the meadow community characteristic indexes;2, themain forage grass species inflorescences.3,the corresponding change offorage allowance, the goats dailygain and feed intake under different grazing treatment. For local goats grazing system balanceoptimization, mountain grassland animal husbandry development, provide theoretical support continuedefficient use of the grassland. The main results were as follows:A. High intensity of grazing grass can reduce inflorescences, height and coverage of perennialryegrass, within a certain range increase the height and coverage of white clover; And low intensity ofgrazing make main forage grass components in turn reduces of white clover and perennial ryegrass, tallweeds invaded. Both can cause the degradation of grassland. Grazing reduced underground biomass,reducing the main part is concentrated in the0-10cm soil layer, theunderground biomass decreasegradually increased with increasing grazing intensity. Below-ground biomass decreased with increasingsoil depth. The grazing intensity season conversion processing group, high-quality forage component isrelatively constant.B. Grazing significantly change the configuration of the grass, moderate grazing disturbanceenhanced herbs communities ecological adaptability.H-H group average monthly plexus of perennial ryegrass tiller number (143/bundle) larger than L-L group (113/bundle), but single tillers weighs less than L-L group.Similar to perennial ryegrass, inflorescences single tillers and clump weight and cluster diameteralso present different negative correlation relationship between number of tillers, and tillering yellowingdiameter increases, the clump of increase in the number of tillers. Average cluster highest tiller numberfor H-H group, reached112/plexus, the least for L-L group, only is81per bundle. Single tillersaverage heaviest for L-L group reached0.154g. L-group H plexus tiller number gradually increaseafter the grazing intensity transformation, and maintain at the levels of100-115/plexus.White clover increase leaf number to occupy the resource space.In average height higher grasslandcommunities, they increased the weight of leaf. H-H groups white clover stolon density is higher thanother groups (p <0.05), shorter internode length. And L-L group of white clover stolon density is low,the quality of the stolon internode length is longer, the unit length is larger (p <0.05).C. Persistent heavy or light grazing can slow down the grass growth rate, reduce the grasslandproductivity. Goat daily gain, forage and feed intake present positive correlation between and among all.H goats grazing capacity test group average feed intake was2.092kgDM/D/a, weight is62.64g, and Lgoats grazing capacity group average feed intake is1.788kgDM/D/a, weight is59.11g. Between twogroups of goats, feed intake and daily gain were significant difference (P <0.05). H goats grazingcapacity group weight range of33.67~85.81g, the growth rate is as high as254.85%, and L goats grazing capacity group growth is31.55~95.33g, a267.37%increase. Highest amount of monthlyaverage pasture to L-L,9.135kgDM/D/a, and H-group H, lowest6.263kgDM/D/a. Growth betweeninterstate to H-L, the largest growth rate up to260.63%. The different treatment between the feedintakes of goats under the no difference (P <0.05).Each treatment group were imbalanced in supply and demand to a certain extent, but the intensityof grazing seasons between conversion and other appropriate means, such as mowing silage that canalleviate to some extent, such as breeding of supply and demand contradiction, breeding season,dynamic balance. |
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