“…The absence of Meissner's plexuses which sense the lumen environment might be related to smooth muscle hypertrophy ( Pavone et al., 2019 ). Through this study, we recommend paying attention to pigeon breeding and public awareness to reduce the risk of contracting diseases and transmitting these diseases to other avian and animal species as well as humans, through the application of biosecurity & quarantine measures, strengthening the general health of pigeons by using of balanced feed and supplying the bird with safe environmentally friend preparations as herbal extracts ( Abou-Kassem et al., 2021a ; Abd El-Hack et al., 2021a ), essential oils ( Alagawany et al., 2021a ; Dosoky et al., 2021 ; El-Tarabily et al., 2021 ; Mohamed et al., 2021 ), essential amino acids ( Abou-Kassem et al., 2021b ), bioactive peptides ( El-Saadony et al., 2021a , b ), probiotics ( Alagawany et al., 2021b , El-Saadony et al., 2021c ), prebiotics ( Abd El-Hack et al., 2020 , 2021b ; Yaqoob et al., 2021 ), plant-derived natural bioactive compounds ( El-Saadony et al., 2021d ; Raza et al., 2021 ; Seidavi et al., 2021a , b ), biological synthesized nanoparticles ( Abd El‐Hack et al., 2021c , d ; El-Saadony et al., 2021e ), and phytogenic compounds ( Abo Ghanima et al., 2021 , Ashour et al., 2021a ; Abdel-Moneim et al. ; Ashour et al., 2020b , Reda et al., 2021 ).…”