Grazing dynamics in natural grassland : quantification of animal productivity and the vegetation control

为了评估草地畜牧业动物的采食量，开展了放牧动物能量消耗估算方法的建立和动物生产系统的模拟。实验结果表明，从GPS和GIS数据中获取的放牧动物活动数据可以作为估测生态效率的指标。此外，还建立了畜牧生产系统模型，在畜群水平上优化畜禽饲料的经济和环境利用。

Development of the methods for estimating energy expenditure(EE) of grazing animals and modeling animal production systems were performed for the purpose of evaluating the amount of grazing intakes of livestock animals on grasslands. Experimental results suggested that activity data of grazing animals obtained from GPS and GIS data could be an index of estimating EE. In addition, animal production system models were developed to optimize feed utilization of animals economically and environmentally at herd level.