Effects Of Grazing Pressure On Intake And Performance Of Goats On Sown Pasture In South China

The study supported by national public welfare project "Different Regional Meadows andLivestock Configuration" The study was on the south subtropical artifical grassland in theZHONGYANGCHANG of xundian of Yunnan Province. The study divided into two grazing.,highstocking rate is11sheep units/ha, low stocking rate is7sheep units/ha. By studying the changingrelationship among the different grazing pressure of goats and goat feed intake, daily gain and pastureallowance and study of different grazing pressure on grassland vegetation characteristics. Finally, afterthe results of the livestock balance and system and economic benefits analysis and research, to provideeffective solutions for grazing goats forage supply,development of grassland animal husbandry, rationalutilization of grassland resources, adjust the livestock structure to provide scientific information toimprove the survival rate of livestock grazing and improve herdsmen's living standards and increaseincome of people. The main research results are as follows:(1) The ground biomass decided the forage grass allowance, the response of the biomassinflorescences have accounted for about50%of the total biomass and above, it extent the forage grassallowance. Goats selective food intake behavior and the grass characteristics, such as the groundbiomass, grass layer structure, etc, is under the goats grazing influence on the main factors of foragegrass to feed themselves, these factors directly affect the goat intake.(2) Goats daily gain increased with the increase of grassland supply, high stocking rate of goatsweight gain (228%) was significantly (P <0.01) higher than the high stocking rate of goats weight gain(63%). High stocking rate goats, average daily gain of only64g/d/only, average daily gain of the lowstocking rate group of goats, but reached only90g/d, the low stocking rate group average daily gainhigher stocking rate group of high41%. The effect for weight gain,the high stocking rate group is farlower than the low stocking rate group. Goat daily gain and feed intake show a corresponding trend, thegreater the feed intake, the higher the goats daily gain. High stocking rates and low stocking rates of twogroups of goats processing goats feed intake significant difference (p <0.05), respectively for1.77kgDM/each/d and1.88kg DM/each/d; Feed intake with the increase in the amount of grass allowanceincreases. Explain the grass allowance to a certain extent the livestock feed intake of decision.(3) In the typical Southern subtropical grass, goat ADG with the increase of grassland supply increases,goat ADG with the growth of feed intake and growth, Within a certain range, grass supply increases willincrease the intake of the goats. The three relationships: within a certain range, with the grass supplyincreases, goats, feed intake increases, the goats daily gain also will increase. Forage quality will affectthe goats, feed intake, goat feed intake determined by several factors.(4) Grazing will reduce the height and cover of Dactylis glomerata, grazing help to increase theheight and cover of white clover, Moderate grazing ryegrass height, grazing or grazing stocking ratewill increase the coverage of the weeds; grazing pasture before and after crude fat, crude protein, hasdeclined, but not obvious, the need for further Long-term studies. Stocking rate the greater the contentof the roots of the corresponding surface soil is less, the impact of different stocking rates on belowground biomass occurs mainly in the0-10cm soil layer, before and after grazing, thebelow-ground biomass of plant communities are mainly concentrated in the0-20cm soil layer,accounting for about90%of the total. After grazing, from plant height,coverage, plant nutrition andunderground biomass to analysis.Under HH grazing rate, the Dactylis glomerata's height, coverage, andbelow-ground biomass is the lowest, Under LL grazing rate, the Dactylis glomerata's height, coverage,and below-ground biomass is the largest. Description of the impact of grazing on the LL group muchsmaller than the HH group. But from a long-term rational use of grassland, it seems that the HH groupand LL group did not meet the ideal standards of livestock balance, HH excessive use, the LL group isthe lack of grazing.(5) After feeding the high stocking rate group Goats show a growth trend, average daily gain for the4gand low stocking rate group of goats off the fat in the feeding process, ADG-6g; high stocking rategroup and low stocking rate group in the actual process of grazing, the actual stocking rate basically notheoretical stocking rate to achieve consistent, high stocking rate group most cases, animal husbandry,serious, low stocking rate group was grazing less than resulting in a waste of grassland resources. Underthe circumstances, we should be reasonable to adjust stocking rates.(6) Full-year economic benefits of the high load group-effectiveness of stocking rate of113,315yuan,much higher than the low stocking rate group of64,590yuan. High set stocking rate group of48,725yuan higher than the low stocking rate group, the high stocking rate group of Maori/sheep for2060yuan,1845yuan higher than the low stocking rate group. As set stocking rate group of Maori/hm~2in25,181yuan, much higher than the low stocking rate group of14,353yuan, after feeding, the economicbenefits of the two groups has widened the gap, should pay attention to feeding the role.(7) Comprehensive annual summer-autumn grazing and winter-spring feeding process. HH group usingexcessive,LL group were underutilized situation, resulting in a waste of grassland resources. Takentogether the grass forage growth rate, we should promptly adjust stocking rates and rational utilizationof grass: in the winter and spring feeding process, we must reasonable ratio of feeding concentrate andsupply. Because feeding directly decide the ultimate cost-effectiveness, so we must pay full attentionto the role of supplementation.