Jiande Song

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160 Haline white chickens at 25 days old, negative for antibody to infectious bursa disease virus (IBDV), were randomly allocated into four groups. Chickens in groups 2-4 were infected with 0.3 ml IBDV at 26 days old. Chickens in groups 3 and 4 were injected respectively with 5 and 10 mg astragalus polysaccharide (APS) for 6 consecutive days from the first(More)
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