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Apparent digestibility, rumen fermentation, digestive enzymes and urinary purine derivatives in yaks and Qaidam cattle offered forage-concentrate diets differing in nitrogen concentration

Animal PhysiologyNutritionNitrogen ConcentrationAnimal ScienceAnimal NutritionApparent DigestibilityForage-concentrate DietsAgricultural EconomicsFeed IntakeEducationFeed AdditiveAnimal FeedPublic HealthMetabolismAnimal ProductionFeed Utilization