Effects of ginger extract and/or propolis extract on immune system parameters of vaccinated broilers by Eman M. Abdel-Maksoud, Ahmed Abd El Fattah Daha, Nabil M. Taha, Mohamed A. Lebda, Kadry M. Sadek, Mohammad Y. Alshahrani, Ahmed Ezzat Ahmed, Mustafa Shukry, Sabreen E. Fadl, Mohamed Elfeky

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