tailieunhanh - Climate Change and Managed Ecosystems - Chapter 13

Cảnh quan nông nghiệp của Canada bao gồm một số ha chế ngự hoặc hạt cỏ và ha đất tự nhiên Một quan trọng phần của thức ăn gia súc này được sử dụng bởi ngành công nghiệp thịt bò của Canada như là một nguồn thức ăn cho bò, bò, và chứng khoán đang phát triển / trẻ. Vi sinh vật phân hủy của thức ăn gia súc và kết quả trong thức ăn chăn nuôi khác trong dạ cỏ, còn được gọi là quá trình lên men đường ruột, sản xuất khí mê-tan | 13 Strategies for Reducing Enteric Methane Emissions in Forage-Based Beef Production Systems . Ominski and . Wittenberg CONTENTS Enteric Mechanisms by Which Methane Production May Be Management Strategies Leading to a Reduction in Enteric Methane Forage Pasture Management. 266 Forage Preservation and Processing. 266 Feed Improved Production A Systems-Based Approach to Summary and INTRODUCTION The Canadian agricultural landscape includes some 4 804 496 ha of tame or seeded pasture and 15 391 072 ha of natural land for A significant portion of this forage is used by the Canadian beef cattle industry as a source of feed for cows bulls and growing young stock. Microbial breakdown of forage and other feedstuffs in the rumen also known as enteric fermentation results in the production of methane. Approximately 87 of enteric methane originates in 261 2006 by Taylor Francis Group LLC 262 Climate Change and Managed Ecosystems the reticulo-rumen while the remainder is produced in the hindgut. A significant portion of the latter approximately 89 is absorbed and expired through the lungs with the remainder being excreted through the anus 2 3 Losses in gross energy intake associated with methane production range from 2 to 3 of gross energy intake GEI when animals are fed high-grain diets4 to of GEI when consuming low-quality In Canada enteric fermentation as calculated using Intergovernmental Panel on Climate Change IPCC Tier I values contributes approximately 19 000 kt CO2 equivalents year-1 approximately 32 of total agricultural An understanding of the microbial processes responsible for the production of enteric methane production coupled with the identification of .