Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 18 of 18 for “"Necrotic Enteritis"”.
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DEVELOPING STRATEGIES TO CONTROL NECROTIC ENTERITIS IN BROILER CHICKENS
Necrotic enteritis (NE) caused by Clostridium perfringens (CP) remains a continuous challenge worldwide in the broiler chicken industry. Therefore, the objective of this thesis was to develop effective control strategies against NE. After the literature review of NE in Chapter 1, the development of …
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Metatranscriptomics Analysis of Ileum Microbial Communities in Necrotic Enteritis Chickens
<p>Necrotic enteritis (NE) is a recognized multifactorial disease that causes an annual loss of $6 billion to the poultry industry. Thus, it has become essential to carry a comprehensive study of the composition of chicken gut which hosts this disease. The objective of this research is to measure …
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Managing Poultry Gut Integrity, Immunity and Microbial Balance During Necrotic Enteritis
Necrotic enteritis (NE) is a major enteric disease in commercial poultry and manifests itself in clinical and subclinical forms. Despite years of research, NE is still among the leading diseases with the greatest economic impact on poultry production. Subclinical forms lead to poor performance …
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Studies on Virulence Factors of Clostridium perfringens and Necrotic Enteritis in Chickens
<p>Necrotic enteritis (NE) is an economically important disease of the poultry industry. It is caused by <em>Clostridium perfringens</em> (CP) and the pathogenesis of the disease is still unknown today. The role of alpha toxin (AT) in the pathogenesis of the disease has recently come into question. …
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Effects of Calcium and Enzyme Supplementation on the Occurrence of Necrotic Enteritis
… digestibility and bone mineralization during necrotic enteritis (NE). In each experiment, Cobb 500 broilers were obtained from a commercial hatchery and housed in floor pens at the Virginia Tech Turkey Research Center. Birds were placed on used litter from a previous flock that had presented …
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Investigating the Potential of Microbial Metabolites and mTOR Signaling on Chicken Necrotic Enteritis
<p>Necrotic enteritis (NE), caused by C. perfringens and coccidiosis, is responsible for substantial economic loss annually. In the first chapter, we investigated the effect of secondary bile acid on necrotic enteritis. Day-old broiler chicks were randomly assigned to 5 groups of diets supplemented …
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Enterococci and its enterocins as an alternative to antibiotics in poultry affected by necrotic enteritis
… perfringens infections associated with necrotic enteritis (NE) are one of the major threats of the poultry sector, that requires a close surveillance. Antibiotic resistance in C. perfringens is emerging, but as this microorganism is not subject to surveillance programmes, more …
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The effects of Bacillus subtilis, dietary calcium and coccidial vaccines in broilers experiencing naturally occurring necrotic enteritis
Necrotic enteritis (NE) is a disease that negatively affects broiler performance and has increasingly become a problem with the reduced use of antibiotics. There is increased interest to utilize alternative methods including coccidial vaccines and direct fed microbials (DFM) to reduce or prevent …
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The Influence of Necrotic Enteritis, Environmental Factors, and Genetics on Intestinal Development Pathways and Disease Occurrence in Broiler Chickens
… On average, houses that had histories of necrotic enteritis harbored a greater abundance of C. perfringens spores. Colonies that were isolated on the specialized medium were confirmed using PCR as C. perfringens. Lastly, Chapter 4 examined how genetic selection for multiple traits has …
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In ovo and feed application of probiotics or synbiotics and response of broiler chicks to post-hatch necrotic enteritis
… enteric diseases in broiler production is necrotic enteritis (NE), caused by the ubiquitous opportunistic bacteria Clostridium perfringens (CP). With the worldwide reduction in antibiotic growth-promoters (AGPs), there is increased interest in natural alternatives to reduce disease and …
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Evaluation of the Effect of a Lippia organoides Essential Oil Extract on Clostridium perfringens Proliferation In Vitro and Necrotic Enteritis in Broiler Chickens
… parameters, intestinal integrity, and necrotic enteritis (NE) in broiler chickens. To do this, a previously established challenge model for NE was utilized which included challenging with Salmonella Typhimurium on day 0, Eimeria maxima on day 18, and Clostridium perfringens on days 22 …
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Immunological Response to Clostridium perfringens in Two Genetically Divergent Lines of Chickens as Influenced by Major Histocompatibility Complex (MHC) Genotype
… were 96% B²¹. During a clinical outbreak of necrotic enteritis, B²¹B²¹ genotypes experienced significantly less mortality (6% vs. 13 %) compared to B¹³B¹³ genotypes. A study was carried out to assess immunological differences between LA and HA lines during exposure to Clostridium perfringens. …
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Nutritional strategies to control clostridium perfringens in gastrointestinal tract of broiler chickens
… Clostridium perfringens populations and necrotic enteritis (NE) in broiler chickens. In the first experiment, birds were fed high concentrations of dietary protein (fish meal or soy protein concentrate) and soluble fiber (guar gum). Clinical NE was not observed, however, there was a high …
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Validation of the Fung double tube to enumerate Clostridium perfringens from the intestinal contents of broiler chickens raised on different diets
Clostridium perfringens causes necrotic enteritis (NE), resulting in decreased feed efficiency and increased mortality, costing the poultry industry USD 2 billion a year worldwide. The objective of the first trial was to validate the Fung Double Tube (FDT) to detect and enumerate C. perfringens in …
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The Effect of Dietary Phytic Acid Concentration and Phytase Supplementation on Performance, Bone Ash, and Intestinal Health of Broilers Vaccinated With a Live Coccidial Oocyst Vaccine
… to feed intake, body weight gain, and it induced necrotic enteritis (P ≤ 0.05). Adding phytase on top of nutritionally adequate diets did not improve performance (P ≥ 0.05), but did improve (P ≤ 0.05) apparent IAAD and morphology of the small intestine, especially in younger birds. In addition, it …
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Regulation of pilus production by the PilR/PilS two-component and Agr-like quorum sensing systems in Clostridium perfringens
Clostridium perfringens type G isolates cause necrotic enteritis (NE) in poultry. Their pilus plays a role in adhesion and is important in pathogenesis. The NE pilus in these isolates consists of three pilins (CnaA, FimA, FimB) encoded by three genes that belong to the VR-10B allele of the VR-10 …
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Analysis of TpeL secretion in Clostridium perfringens
… toxin that is associated with chicken necrotic enteritis, a disease that costs the poultry industry billions of dollars each year. TpeL belongs to a subset of clostridial toxins characterized by their large size and conserved structure, the large clostridial toxins. The gene for tpeL …
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Towards a Better Understanding of Poultry Intestinal Microbiome through Metagenomic and Microarray Studies
… reuse did not appear to increase the risk of necrotic enteritis caused by <i>C. perfringens</i> or <i>Salmonella</i> infection in subsequent flocks.</p><p>Taken together, the findings of the series of studies on poultry intestinal microbiome advanced our knowledge on the bacterial communities …