title: Ileal MUC2 gene expression and microbial population, but not growth performance and immune response, are influenced by in ovo injection of probiotics in broiler chickens.
abstract: 1. The objective of present study was to evaluate the effects of intra-amniotic injection of different probiotic strains (Bacillus subtilis, Enterococcus faecium and Pediococcus acidilactici) on the intestinal MUC2 gene expression, microbial population, growth performance and immune response in broiler chicken. 2. In a completely randomised design, different probiotic strains were injected into the amniotic fluid of the 480 live embryos (d 18 of incubation), with 4 treatments and 5 replicates. Ileal MUC2 gene expression, microbial profile, growth performance and immune response were determined. 3. Injection of probiotic strains, especially B. subtilis, had significant effect on expression of the MUC2 on d 21 of incubation and d 3 post-hatch, but not on d 19 of incubation. 4. Injection of the probiotic strains decreased significantly the Escherichia coli population and increased the lactic acid bacteria population during the first week post-hatch. 5. Inoculation of probiotics had no significant effect on antibody titres against Newcastle disease virus, antibody titres against sheep red blood cell and cell-mediated immune response of chickens compared to control. 6. In ovo injection of the probiotic strains had no significant effect on growth performance of broiler chickens. 7. It was concluded that injection of probiotic bacteria especially B. subtilis into the amniotic fluid has a beneficial effect on ileal MUC2 gene expression and bacteria population during the first week post-hatch, but has no effect on growth performance and immune response in broiler chickens.
authors.affiliation: a Department of Animal Science, Science and Research Branch , Islamic Azad University , Tehran , Iran.
authors.forename: A
authors.initials: A
authors.lastname: Majidi-Mosleh
authors.affiliation: a Department of Animal Science, Science and Research Branch , Islamic Azad University , Tehran , Iran.
authors.forename: A A
authors.initials: AA
authors.lastname: Sadeghi
authors.affiliation: b Department of Animal Science, Varamin-Pishva Branch , Islamic Azad University , Varamin , Tehran , Iran.
authors.forename: S N
authors.initials: SN
authors.lastname: Mousavi
authors.affiliation: a Department of Animal Science, Science and Research Branch , Islamic Azad University , Tehran , Iran.
authors.forename: M
authors.initials: M
authors.lastname: Chamani
authors.affiliation: c Department of Animal Science, Karaj Branch , Islamic Azad University , Karaj , Iran.
authors.forename: A
authors.initials: A
authors.lastname: Zarei
mesh_terms: D000818:Animals; D001412:Bacillus subtilis / Q000502:physiology; D002642:Chick Embryo / Q000382:microbiology*; D002645:Chickens / Q000254:growth & development / Q000276:immunology / Q000378:metabolism*; D015169:Colony Count, Microbial; D004926:Escherichia coli / Q000166:cytology; D015870:Gene Expression; D007082:Ileum / Q000378:metabolism* / Q000382:microbiology*; D055262:Mucin-2 / Q000235:genetics*; D019936:Probiotics / Q000008:administration & dosage*
chemical_list: D055262:Mucin-2
keywords: In ovo injection; broiler chickens; immune response; microbial population; probiotic