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The Murky Murk Demand and Supply AnalysisThe Murky Murk Demand and Supply Analysis“The Murky Murk”Wes Ishmael, Contributing EditorBeef MagazineOctober 2006Mandatory livestock ID systems have been a subject focused on repeatedly in beef farming magazines this year. NAIS (National Identification System) is designed to track livestock for animal health purposes, with the ultimate aim to be.