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Study on biological characteristics, production capacity and economic efficiency of the eastern spot-billed duck (anas poecilorhyncha zonorhyncha) raised in households in Ninh Binh Province
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Scientific Journal of Tan Trao University Km6, Trung Mon Commune, Yen Son District, Tuyen Quang Province, Viet Nam Email: sjttu@tqu.edu.vn