Tham khảo tài liệu 'climate change and managed ecosystems - chapter 12', khoa học tự nhiên, công nghệ sinh học phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 12 Ruminant Contributions to Methane and Global Warming A New Zealand Perspective . Waghorn and . Woodward CONTENTS Relevance of Greenhouse Gases for New Zealand New Zealand GHG Nitrous Defining Methane Relationship between Diet Composition and Methanogenesis. 241 Methane Emissions from Ruminants Fed Fresh Forages . 242 New Zealand Measurements. 242 Pasture Methane Measurements outside New Zealand. 244 Condensed Tannins and Methanogenesis . 244 Animal Variation in Management to Mitigate Methane in Grazing Feed Additives. .248 Removing the Protozoa Defaunation .248 Targeting Agronomy and Complementary Nitrous Oxide Emissions and Mitigation Animal Management and Whole-Farm Summary and Acknowledgments. 255 References. 256 233 2006 by Taylor Francis Group LLC 234 Climate Change and Managed Ecosystems INTRODUCTION An overview of the implications research and policies concerning greenhouse gas GHG emissions from New Zealand agriculture is presented. Most emphasis is given to methane from ruminants and to opportunities for mitigation in forage-based feeding systems. The opportunities for practical reductions in both methane and nitrous oxide emissions are indicated. The underlying principles affecting levels of methane emissions from ruminants are examined and compared with values obtained from sheep and cattle fed fresh forages. Opportunities for mitigation are presented as short- medium- and longterm strategies. Topics include the bases for animal variance effects of management and diet as well as potential mitigation through rumen additives. The .
