Contributors -- Preface -- 1 Sustainability of Grazing Systems: Goals, Concepts and Methods -- 2 Effects of Nitrogen and Water Supply on N and C Fluxes and Partitioning in Defoliated Swards -- 3 An Integrated View of C and N Uses in Leaf Growth Zones of Defoliated Grasses -- 4 Effects of Grazing on the Roots and Rhizosphere of Grasses -- 5 Reserve Formation and Recycling of Carbon and Nitrogen during Regrowth of Defoliated Plants -- 6 Shoot Morphological Plasticity of Grasses: Leaf Growth vs. Tillering -- 7 Tiller Dynamics of Grazed Swards -- 8 Effect of Nitrogen on Some Morphogenetic Traits of Temperate and Tropical Perennial Forage Grasses -- 9 Modelling the Dynamics of Temperate Grasses and Legumes in Cut Mixtures -- 10 Plant-Animal Interactions in Complex Plant Communities: from Mechanism to Modelling -- 11 Modelling Spatial Aspects of Plant-Animal Interactions -- 12 Defoliation Patterns and Herbage Intake on Pastures -- 13 Selective Grazing on Grass- Legume Mixtures in Tropical Pastures -- 14 Leaf Tissue Turnover and Efficiency of Herbage Utilization -- 15 Dynamics of Heterogeneity in a Grazed Sward -- 16 Soil-Plant-Animal Interactions and Impact on Nitrogen and Phosphorus Cycling and Recycling in Grazed Pastures -- 17 Sustainable Management of Pasture and Rangelands -- 18 Campos in Southern Brazil -- 19 Campos in Uruguay -- 20 Argentina's Humid Grazing Lands -- The Final Resolution -- Index.