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 20 of 24 for “"bovine respiratory disease"”.
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Diagnostics and risk factors for bovine respiratory disease
… inaccuracy and unknown risk distributions for bovine respiratory disease (BRD) are some of the most important issues faced by the feedlot industry. Given these issues, the overarching themes of this thesis are on the evaluation of point-of-care diagnostic methods for BRD and on summarizing, …
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Field comparison of intranasal and injectable bovine respiratory disease vaccination on beef calf antibody concentrations, average daily gain, and bovine respiratory disease morbidity
Bovine respiratory disease (BRD) is a multifactorial disease complex that is common in feedlot operations, where it causes major economic loss through: reduction in average daily gain, treatment costs, and mortality. Reducing BRD incidence would increase profits to producers, reduce antimicrobial …
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Mitigation of Bovine Respiratory Disease Complex: Interactions of Physiology, Immunology, Nutrition and Management
… determine the effects of on-arrival vs. delayed respiratory vaccination and exposure to persistently infected bovine viral diarrhea virus challenge on health, gain performance, and physiological and immunological measurements in newly received stocker cattle. Two experiments evaluated timing (d 0 …
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A MULTIMODAL CLINICAL AND DIAGNOSTIC APPROACH TO BOVINE RESPIRATORY DISEASE COMPLEX (BRDC) IN DAIRY CALVES
Calf bronchopneumonia (BP), or Bovine Respiratory Disease Complex (BRDC), to date is still difficult to diagnose due to the multifactorial nature of its etiopathogenesis and aspecificity of clinical symptomatology. In this research project, four studies were conducted to investigate various aspects …
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Lung auscultation as a predictor of lung lesions and bovine respiratory disease outcome in feed yard cattle
Bovine respiratory disease complex (BRDC) is the most common, and costly, disease in feed yard cattle. A review of the literature shows a correlation between the diagnosis of BRDC ante-mortem and respiratory lesions at slaughter. The objectives of the studies reported here were to: 1) validate a …
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Pasteurella multocida biofilm formation, and the interrelationship of P. multocida with Histophilus somni in a polymicrobial biofilm during bovine respiratory disease
… and zoonotic pathogen that is capable of causing respiratory and multi-systemic diseases, bacteremia, and infections resulting from bite wounds. The glycosaminoglycan capsule (CPS) of P. multocida is an essential virulence factor, protecting the bacterium from host defenses. However, chronic …
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The potential of antimicrobial resistance diagnostics to inform prudent antimicrobial use in feedlot cattle: dynamic models as tools for optimizing interventions in bovine respiratory disease
… systems to control and treat bacterial diseases in food animals. The misuse and overuse of antimicrobial drugs in agricultural settings as elsewhere accelerates the selection of resistant pathogens; emerging antimicrobial resistance (AMR) threatens the therapeutic efficacy of available …
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The effect of supplementation strategy, stress level, and tall fescue type on performance of fall-weaned beef calves
… in a weakened immune systems at the height of disease risk, frequently causing bovine respiratory disease. Backgrounding programs facilitate opportunities for calves to overcome stressors by building immunity, and adapting the rumen to high concentrate diets for improved feedlot performance. …
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CLINICAL APPLICATIONS OF PARAOXONASE-1 IN DOMESTIC ANIMALS: BEYOND CONVENTIONAL INFLAMMATORY MARKERS
… in the pathogenesis and diagnosis of many diseases characterized by inflammation and/or oxidative stress, both in human and veterinary medicine. In veterinary species, PON-1 measurement is to date primarily restricted to the research field and has not been yet undertaken in the routine …
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Sensing at nanostructures for agri-food and enviromental applications
… of viruses and antibodies associated with bovine respiratory disease and bovine liver fluke. The silicon chip devices consist of six on-chip nanoband electrodes which can be independently modified with a polymer layer for covalent immobilisation of capture and target biomolecules. This …
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Effects of Respiratory Vaccination Timing and Hormonal Growth Implant on Health, Performance, and Immunity of Newly Received Stocker Calves
… for energy required for immune response during bovine respiratory disease (BRD) challenge. This study was conducted to determine the effects of pentavalent respiratory vaccination timing with or without a hormonal growth implant on arrival (d 0) on health, performance, complete blood count, and …
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Effect of Yeast Supplementation During Various Stages of Beef Production
… = 0.29) in the percentage of calves treated for bovine respiratory disease. In experiment 2, heifer calves (n = 95; initial BW = 165 ± 27 kg) were randomly assigned to pastures and pastures were randomly assigned to treatment: 1) no yeast (CON), or 2) addition of yeast product (YP). Heifers were …
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GENOMICS OF EFFICIENCY, RESILIENCE AND BIODIVERSITY IN HOLSTEIN AND LOCAL CATTLE BREEDS
… impact of genomic variations on traits linked to disease resistance (e.g., mastitis and bovine respiratory disease) and milk production efficiency. The Holstein breed, a specialised cosmopolitan population known for its high milk production and intensive farming system, served as a reference. In …
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Supplemental Trace Minerals (Zn, Cu, and Mn) as Sulfates or Hydroxy Trace Mineral Sources for Beef Heifers
… in the percentage of heifers treated for bovine respiratory disease (P = 0.77) or foot rot occurrence (P = 0.57) between sulfate and hydroxychloride treatments. Trace mineral source did not affect overall pregnancy rates (P = 0.85). Therefore, supplementing either a sulfate or …
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Effect of Feeding Different Protein and Energy Supplements on Performance and Health of Beef Calves During the Backgrounding Period
… are highly susceptible to the incidence of bovine respiratory disease. In addition to high levels of stress, decreased feed intake and exposure to foreign antigens result in increased morbidity and possibly death losses. Four backgrounding trials were conducted to examine the effects of …
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Evaluation of By-product Feedstuffs, Level of Concentrate, and Selenium and Vitamin E Injections on Performance and Health of Beef Calves in Backgrounding Systems
… system, which can lead to increased incidence of diseases, especially bovine respiratory disease complex (BRDC). Backgrounding cattle post-weaning and prior to feedlot entry may alleviate some of the more common stresses and typically diminished feed intake. Five trials were conducted with a total …
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PEPTIDE ENGINEERING FOR DEVELOPMENT OF ANTIMICROBIALS AGAINST Mannheimia haemolytica
Mannheimia haemolytica (M. haemolytica)-induced bovine respiratory disease causes millions of dollars in economic losses to Canadian cattle industry. Contemporary management strategies built around the use of antimicrobials are proving to be increasingly unavailing and lead to drug residues in meat …
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Effects of Pasteurella haemolytica on Pulmonary Vascular Adrenergic Mechanisms
Pneumonic pasteurellosis is a significant disease in beef production medicine. The most recent information suggests that this disease is a $700 million dollar per year economic burden in bovine food animal production The medical and pathological characteristics of this disease are well documented. …
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The effects of dosing feedlot cattle with Megasphaera elsdenii strain NCIMB 41125 prior to the introduction of a grain-rich diet
… for reducing the number of cattle treated for bovine respiratory disease. Angus steers and heifers (n = 3179; average BW = 356 ± 58.4kg) were used in a randomized complete block design with two treatments. Cattle were assigned to treatment on an every-other-head basis such that …
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Characterization of the Beta-2 Adrenergic Receptor Mechanism in Bovine Neutrophils, and Some Effects of Inflammatory Stimuli on its Function
The bovine polymorphonuclear leukocyte (neutrophil) is a central component of the acute inflammatory response, and is capable of reacting to a myriad of pro-inflammatory chemical signals that have been characterized in the context of bovine respiratory disease (BRD). Human neutrophils and bovine …
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