Rotational and continuous grazing of sheep in the Inner Mongolian steppe of China.
Rotational and continuous grazing of sheep in the Inner Mongolian steppe of China.
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DOI：
10.1111/j.1439-0396.2008.00810.x
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发表时间：
2009-04
影响因子：
2.7
通讯作者：
C. Wang;B. Tas;T. Glindemann;K. Mueller;A. Schiborra;P. Schoenbach;M. Gierus;F. Taube;A. Susenbeth
中科院分区：
文献类型：
--
作者：
C. Wang;B. Tas;T. Glindemann;K. Mueller;A. Schiborra;P. Schoenbach;M. Gierus;F. Taube;A. Susenbeth
本研究旨在比较轮牧和连续放牧对内蒙古草原放牧绵羊牧草质量（HM）、有机物消化率（dOM）、采食量（OMI）和活重（LWG）的影响。在2005年和2006年，使用了四个2公顷的地块，其中两个被分成四个0.5公顷的围场，每个围场用于轮流放牧，每隔10天将羊移到下一个围场。通过口服二氧化钛，从粪便粗蛋白浓度和OMI估计dOM。两种放牧方式的牧草质量相似，连续放牧的dOM和OMI高于轮牧（p < 0.05），但LWG差异不显著，可能是因为放牧和放牧在更大范围内消耗了额外的能量。dOM和OMI随生长季节的进展而降低（p < 0.05），且存在年际差异。由于在这两年的生长季节降水量低于30年的平均水平，这可能是原因，非放牧期牧草的再生和质量的积极影响，在轮牧不能发生，需要进一步的研究，在这些放牧系统的最终评估之前，平均降水量的年份。此外，在放牧研究中，似乎有必要量化动物体力活动的能量消耗。
The aim of this study was to compare the effects of rotational and continuous grazing on herbage mass (HM), organic matter digestibility (dOM) and intake (OMI) and live weight gain (LWG) of sheep grazing on the inner Mongolian steppe, China at a stocking rate of 4.5 sheep/ha during the growing season. In the years 2005 and 2006, four 2-ha plots were used of which two were divided into four 0.5 ha paddocks each for rotational grazing, where sheep were moved each 10 days to the next paddock. The dOM was estimated from faecal crude protein concentration and OMI by oral administration of titanium dioxide. Herbage mass was similar in both grazing systems and dOM and OMI were higher (p < 0.05) at continuous grazing than at rotational grazing, but LWG did not differ probably because of extra energy expenditure for grazing and walking in a larger area. The dOM and OMI decreased (p < 0.05) with progress of the growing season and differed between years. Since precipitation during the growing season in both years was lower than the 30 years average which was probably the reason that positive effects of non-grazing periods on herbage regrowth and quality at rotational grazing could not occur, further studies are required in years with average precipitations before a final evaluation of these grazing systems can be made. Moreover, it seems necessary to quantify energy expenditure for physical activity of animals in grazing studies.