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The world’s livestock sector is amidst a major transformation, fuelled by high demand for meat and milk, which is likely to double over the next two decades in developing countries. The major driving force behind this demand for livestock products is a combination of population growth, urbanization and income growth, especially in developing countries. The challenge is to enhance animal productivity without adversely affecting the environment. A key to this is reducing methane emissions from ruminants. The major limitation to ruminant production in many tropical regions of Africa, Asia and Latin America, where a large proportion of the global ruminant population is located, is poor nutrition. The productivity of animals is restricted by the low nitrogen and high fibre content of the native grasses and crop residues, which form the basis of the diets in these regions. Animals on these types of diets emit more methane than animals fed better quality temperate forages. These methane emissions represent a loss of digestible energy to the animal (up to 15%) as well as a threat to the environment. Reducing methane production by ruminants could improve their productivity, provided the efficiency of ruminal metabolism is not compromised, and reduce their contribution to greenhouse gas emissions. The challenge is to devise nutritional strategies and identify dietary components, particularly from locally available plant resources, that reduce methane emissions.

Ruminants --- Methane --- Greenhouse gas mitigation. --- Feeding and feeds. --- Environmental aspects. --- Abatement of greenhouse gas emissions --- Emission reduction, Greenhouse gas --- Emissions reduction, Greenhouse gas --- GHG mitigation --- Greenhouse gas abatement --- Greenhouse gas emission reduction --- Greenhouse gas emissions reduction --- Greenhouse gas reduction --- Mitigation of greenhouse gas emissions --- Reduction of greenhouse gas emissions --- Pollution prevention --- Methyl hydride --- Alkanes --- Manure gases --- Biogas --- Environmental protection. --- Animal physiology. --- Environmental management. --- Atmospheric Protection/Air Quality Control/Air Pollution. --- Animal Physiology. --- Environmental Management. --- Environmental quality management --- Protection of environment --- Environmental sciences --- Applied ecology --- Environmental engineering --- Environmental policy --- Environmental quality --- Environmental stewardship --- Stewardship, Environmental --- Management --- Animal physiology --- Animals --- Biology --- Anatomy --- Physiology --- Air pollution. --- Air --- Air contaminants --- Air pollutants --- Air pollution --- Air pollution control --- Air toxics --- Airborne pollutants --- Atmosphere --- Contaminants, Air --- Control of air pollution --- Pollutants, Air --- Toxics, Air --- Pollution --- Air quality --- Atmospheric deposition --- Control

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General microbiology --- General ecology and biosociology --- Animal biochemistry --- Biochemical engineering --- Biotechnology --- biodiversiteit --- bio-engineering --- biochemie --- microbiologie --- biotechnologie

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Nature protection --- Animal physiology. Animal biophysics --- Air pollution. Air purification --- Environmental protection. Environmental technology --- methaan --- fysiologie --- luchtverontreiniging --- milieubeleid --- zoölogie

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The aim of this manual is to provide a comprehensive guide to the methods involved in collecting, preparing and screening plants for bioactive properties for manipulating key ruminal fermentation pathways and against gastrointestinal pathogens. The manual will better equip the reader with methodological approaches to initiate screening programmes to test for bioactivity in native plants and find ‘natural’ alternatives to chemicals for manipulating ruminal fermentation and gut health. The manual provides isotopic and non-isotopic techniques to efficiently screen plants or plant parts for a range of potential bioactives for livestock production. Each chapter has been contributed by experts in the field and methods have been presented in a format that is easily reproducible in the laboratory. It is hoped that this manual will be of great value to students, researchers and those involved in developing efficient and environmentally friendly livestock production systems.

Plant bioactive compounds -- Research. --- Plants, Edible -- Testing. --- Rumen fermentation -- Research. --- Ruminants -- Feeding and feeds. --- Ruminants -- Nutrition. --- Rumen fermentation --- Ruminants --- Plants, Edible --- Biology --- Agriculture --- Animal Sciences --- Biology - General --- Health & Biological Sciences --- Earth & Environmental Sciences --- Research --- Feeding and feeds --- Nutrition --- Testing --- Plants --- Feeding and feeds. --- Analysis. --- Plant chemical analysis --- Chemical analysis --- Life sciences. --- Agriculture. --- Biochemistry. --- Plant biochemistry. --- Biodiversity. --- Life Sciences. --- Biochemistry, general. --- Life Sciences, general. --- Plant Biochemistry. --- Botanical chemistry --- Farming --- Husbandry --- Industrial arts --- Life sciences --- Food supply --- Land use, Rural --- Biosciences --- Sciences, Life --- Science --- Biological chemistry --- Chemical composition of organisms --- Organisms --- Physiological chemistry --- Chemistry --- Medical sciences --- Biological diversification --- Biological diversity --- Biotic diversity --- Diversification, Biological --- Diversity, Biological --- Biocomplexity --- Ecological heterogeneity --- Numbers of species --- Composition --- Phytochemistry --- Plant biochemistry --- Plant chemistry --- Biochemistry --- Botany --- Phytochemicals --- Plant biochemical genetics