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The HI titer of NDV antibodies and BW of the commercial broilers. (A) Antibodies titer to the NDV vaccine of commercial broilers determined by homologous HI assay. (B) The BW of 21- and 42-day-old commercial broilers. The average weight and SD (error bars) from 10 independent samples are shown (∗P < 0.05, ∗∗P < 0.01; NS, not significant). Abbreviations: HI, hemagglutination inhibition; NDV, Newcastle disease virus.
