Impacts of synthetic androgen and estrogenic antagonist administration on growth performance, sex steroids hormones, and immune markers of male and female broilers

Younis, Mona; Jaber, Fatima A.; Majrashi, Kamlah Ali; Ghoneim, Hanan A.; Shukry, Mustafa; Shafi, Manal E.; Albaqami, Najah M.; El‐Hack, Mohamed E. Abd; Ghanima, Mahmoud M. Abo

doi:10.1016/j.psj.2022.102244

Cited by 1 publication

(1 citation statement)

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“…Their study further stated that the mortality rate in male chickens was significantly higher than that of female chickens [24]. In another study on broiler chickens, female chickens had a higher phagocytic activity compared with male chickens, indicating that the innate immune response in females is more efficient than that observed in males [25]. However, a study on 18-day-old White Leghorn chickens hatched from specific-pathogen-free (SPF) fertile eggs reported that there was no significant difference in Ark-type IBV pathogenesis between sexes by assessing the viral load in the trachea and cecal tonsil (CT) and by assessing tracheal histomorphometry [26].…”

Section: Introductionmentioning

confidence: 93%

Comparison of Infectious Bronchitis Virus (IBV) Pathogenesis and Host Responses in Young Male and Female Chickens

Isham,

Abd-Elsalam,

Mahmoud

et al. 2023

Viruses

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Infectious bronchitis virus (IBV) is an avian coronavirus that causes a disease in chickens known as infectious bronchitis (IB). The pathogenesis of IBV and the host immune responses against it depend on multiple factors such as the IBV variant, breed and age of the chicken, and the environment provided by the management. Since there is limited knowledge about the influence of the sex of chickens in the pathogenesis of IBV, in this study we aim to compare IBV pathogenesis and host immune responses in young male and female chickens. One-week-old specific pathogen-free (SPF) White Leghorn male and female chickens were infected with Canadian Delmarva (DMV)/1639 IBV variant at a dose of 1 × 106 embryo infectious dose (EID)50 by the oculo-nasal route while maintaining uninfected controls, and these chickens were euthanized and sampled 4- and 11-days post-infection (dpi). No significant difference was observed between the infected male and female chickens in IBV shedding, IBV genome load in the trachea, lung, kidney, bursa of Fabricius (BF), thymus, spleen, and cecal tonsils (CT), and IBV-induced lesion in all the examined tissues at both 4 and 11 dpi. In addition, there was no significant difference in the percentage of IBV immune-positive area observed between the infected male and female chickens in all tissues except for the kidney, which expressed an increased level of IBV antigen in infected males compared with females at both 4 and 11 dpi. The percentage of B lymphocytes was not significantly different between infected male and female chickens in all the examined tissues. The percentage of CD8+ T cells was not significantly different between infected male and female chickens in all the examined tissues except in the trachea at 11 dpi, where female chickens had higher recruitment when compared with male chickens. Overall, although most of the findings of this study suggest that the sex of chickens does not play a significant role in the pathogenesis of IBV and the host immune response in young chickens, marginal differences in viral replication and host responses could be observed to indicate that IBV-induced infection in male chickens is more severe.

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Section: Introductionmentioning

confidence: 93%