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...Management of agricultural forestry and fisheries enterprises vol i livestock production systems e a laca m w demment university california usa keywords ruminants non pastoralist development grazing industrial manure human nutrition biodiversity pollution global warming contents introduction role in food types versus or based principles factors problems mixed products the environment environmental costs current future challenges how will we meet demand for animal abate negative impacts what technologies be socially acceptable conclusions acknowledgements unesco eolss glossary bibliography biographical sketches sample chapters summary about years ago sheep were first animals to domesticated marking beginning new era exponential change today may on verge revolution that require massive increases particularly from has increased steadily during last decade source foods are essential components diets because they best sources some most critical nutrients people iron zinc calcium vitamin b e...