• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Tropical Animal Health and Production >Cattle herd vulnerability to rainfall variability: responses to two management scenarios in southern Ethiopia
【24h】

Cattle herd vulnerability to rainfall variability: responses to two management scenarios in southern Ethiopia

机译：牛群易受降雨变化的影响：埃塞俄比亚南部对两种管理方案的应对

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

We examine how the system of grazing management of cattle in savanna rangelands affects the herd response to drought. We have used long-term time series data to evaluate the effects of management on drought-induced cattle mortality using traditional livestock management practices. There was no control of stocking densities, as compared to a government ranch where stocking densities would be adjusted in accordance with available pasture. We tested the responses under two scenarios. Scenario 1: Response of cattle herds to inter-annual rainfall variability (IRV) under a regulated grazing management system; this provides more reliable predictions of cattle population and performance in terms of herd mortality and calving rates than does the communal land use system. Scenario 2: Regardless of the management system, similar trends in cattle populations will be observed in response to IRV. The results of the study showed that fluctuations in cattle numbers, herd mortality and calving rates were highly correlated with IRV, with stronger linear impacts in accordance with scenario 2. In both management systems, cattle herd sizes and calving rates declined during periods of drought, followed by slow recovery. Cattle populations in Borana rangelands in southern Ethiopia did not recover for a period of two decades. We conclude that a management system based on control of stocking densities did not improve herd survival, as compared with traditional drought management strategies. This contradicts common expectations. Increased drought frequencies aggravated cattle mortality and lowered calving rates. The implication of the findings is that regardless of adjusted stocking density, livestock populations in the arid savanna ecosystems of southern Ethiopia remain at risk from climate change.
机译：我们研究了稀树草原牧场的放牧管理系统如何影响牛群对干旱的反应。我们使用长期的时间序列数据，使用传统的牲畜管理方法评估管理对干旱引起的牛死亡率的影响。与政府牧场相比，无法控制放养密度，而政府牧场会根据现有牧场调整放养密度。我们在两种情况下测试了响应。方案1：在规范的放牧管理制度下，牛群对年际降雨变化（IRV）的反应;与公共土地利用系统相比，这在牛群死亡率和产犊率方面提供了更可靠的牛群数量和性能预测。方案2：无论采用哪种管理系统，都将在应对IRV的情况下观察到牛群的类似趋势。研究结果表明，牛群数量，牛群死亡率和产犊率的波动与IRV高度相关，根据情景2的线性影响更强。在两种管理系统中，干旱期间牛群的规模和产犊率均下降，随后恢复缓慢。埃塞俄比亚南部博拉纳牧场的牛群在过去的二十年中没有恢复。我们得出的结论是，与传统的干旱管理策略相比，基于放养密度控制的管理系统无法提高牧群的生存率。这与共同的期望相矛盾。干旱频率的增加加剧了牛的死亡率并降低了产犊率。研究结果的暗示是，不管调整的种群密度如何，埃塞俄比亚南部干旱热带稀树草原生态系统中的牲畜种群仍然面临气候变化的危险。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号