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. 2021 Dec 20;8:756629. doi: 10.3389/fvets.2021.756629

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Copyright © 2021 Feng, Wang, Zhang, Zhang, Zou, Zhang, Wang, Guo, Qiu, Wang, Xin and Li.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Effect of SGDL granule or doxycycline and both on the antibody response to vaccination against IBV. Group I served as a control. Broilers in Group II were given doxycycline whereas Group III was given SGDL granule through drinking water. Broilers in Group IV were given SGDL granule and doxycycline in drinking water. Extremely significant (p < 0.01) different values are shown with **, and no signal was not significantly (p > 0.05) different between the groups at those time points. SGDL, Shegandilong.