Effect of Sheep Grazing Methods and Intensities on Recovering Forage Cell Wall Components and Nutritive Value of Degraded Grassland by Enclosed

The sheep grazing experiment was carried out in an Inner Mongolian enclosed recovery steppe of the natural grazing pastures in warm season to study the dynamic changes of forage cell wall constituents and nutrients value with the chemical assay and enzymatic analysis.The comparison of grazing systems(control,continuous grazing,4plots rotational grazing,5plots rotational grazing,and 6plots rotational grazing)was made at two levels of grazing intensities(1.0,1.4hm2/un.sh)to create 10treatments and 34pairs of sheep(ewes and their lambs)were grazed over a period of 4months.The results showed,in the whole warm season,forage nutrition contents in different grazing groups were mainly affected by grazing systems significantly on recovering degraded grassland(P0.05).Forage OCW contents in control were significantly higher than those in continuous and rotational grazing groups,then no obvious differences were shown between different rotational grazing groups.The forage high digestibility part(OCC+ Oa)in rotational grazing treatment was obtained high and was significantly higher than continuous grazing treatment.Forage in control showed more Oaand less Ob,and continuous grazing treatment showed reverse trend.There was no obvious difference between forage Oaand Obin rotational grazing groups respectively.The forages obtained higher TDN and ME in rotational grazing groups,especially in August.In the whole warm season,forages in 6plots rotational grazing groups contained the highest nutrients and showed the highest nutritional value.