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Effects of Different Molecular Masses of Chito-Oligosaccharides on Performance, Intestinal Microorganism and IL-2 and TNF-α Gene Expressions in Spleen of Laying Hens
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动物营养学报 . 2013, (11): 2660 -2667 .  DOI: 10.3969/j.issn.1006-267x.2013.11.019