Immunomodulatory effects of Fusarium mycotoxins in broiler breeder pullets infected with Coccidia

dc.contributor.advisorSmith, Trevor K.
dc.contributor.authorGirgis, George
dc.date.accessioned2020-12-03T14:56:01Z
dc.date.available2020-12-03T14:56:01Z
dc.date.copyright2010
dc.degree.departmentDepartment of Animal and Poultry Scienceen_US
dc.degree.grantorUniversity of Guelphen_US
dc.degree.nameDoctor of Philosophyen_US
dc.description.abstractFusarium' mycotoxins are low molecular weight fungal metabolites which are frequently encountered in grains used for poultry feeds, Among these mycotoxins, deoxynivalenol (DON), acetylated DON derivatives and zearalenone (ZEN) are the most commonly detected 'Fusarium' mycotoxins in Canadian-grown feedstuffs. There is a lack of information regarding the effects of 'Fusarium' mycotoxicoses on broiler breeder pullets especially when the birds get infected with pathogens. Experiments were conducted to study the effects of feeding diets naturally contaminated with 'Fusarium' mycotoxins on broiler breeder pullets infected with coccidia, with special emphasis on immune parameters. Coccidiosis is a common disease in the poultry field against which broiler breeder chicks are usually vaccinated in the hatchery or during the first few days of life. The contaminated diets were formulated by replacing corn and wheat of the control diets with those naturally contaminated with 'Fusarium' mycotoxins. It was found that feeding diets naturally contaminated with ' Fusarium' mycotoxins had no effects on immune parameters in the absence of infection. Immunomodulation was observed, however, upon primary and secondary infection with single or multiple coccidia species. Such immunomodulation involved the systemic parameters of total serum immunoglobulin (Ig) concentrations and blood lymphocyte subsets as well as local intestinal parameters such as recruited immune cell subsets and immune-related gene expression. Morphometry of villus-crypt units in the intestinal tract provided evidence of the occurrence of compensatory changes that explained the lack of 'Fusarium' mycotoxins effects on body weight gain in experimental birds. 'Fusarium ' mycotoxins also impaired the recovery of intestinal villi following coccidial challenge. Apart from its mycotoxin binding capacity, a glucomannan mycotoxin adsorbent (GMA) derived from yeast cell wall had immunomodulatory effects on its own. It was concluded that feeding grains containing ' Fusarium' mycotoxins, below levels that affect growth performance, to broiler breeder pullets could modulate immune response to coccidiosis and alter intestinal morphology. It is recommended that the feeding of grains naturally contaminated with 'Fusarium' mycotoxins to broiler breeder pullets should, therefore, be minimized.en_US
dc.identifier.urihttps://hdl.handle.net/10214/21673
dc.language.isoen
dc.publisherUniversity of Guelphen_US
dc.rights.licenseAll items in the Atrium are protected by copyright with all rights reserved unless otherwise indicated.
dc.subjectfeeding dietsen_US
dc.subject|contaminationen_US
dc.subjectFusarium mycotoxinsen_US
dc.subjectbroiler breeder chickensen_US
dc.subjectcoccidiaen_US
dc.subjectimmune parametersen_US
dc.subjectimmune responseen_US
dc.subjectcoccidiosisen_US
dc.titleImmunomodulatory effects of Fusarium mycotoxins in broiler breeder pullets infected with Coccidiaen_US
dc.typeThesisen_US

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