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The effect about immune organ index and biochemical indicators of blood for used the extractive of Echinacea purpurea and Astragalus in chickens following experimental IBDV infection
徐建中 史秋梅
Chinese Agricultural Science Bulletin . 2009, (22): 0 -0 .  DOI: 10.11924/j.issn.1000-6850.2009-1154