The objective of this dissertation was to (1) determine which grow-out and processing sampling points best predicts and causes Campylobacter later in production (2) identify risk factors within the hatchery that influenced Campylobacter prevalence later in production (3) identify biosecurity risk factors that were associated with Campylobacter presence during production and processing (4) identify farm and production characteristics that were associated with Campylobacter presence later in production, and (5) to estimate the proportion of variance and the intraclass correlation coefficients within the hierarchical levels (complex, farm, bird) of the data. The best predictors of post-chill Campylobacter carcass status were the exterior whole carcass sample in the grow-out environment and the crop upon arrival at the processing plant. The best post-chill causal model contained the grow-out whole carcass. Variables associated with the increased odds of a Campylobacter positive sample included controlling the humidity in the hatchery chick room, 2-4 people handling the chicks at the hatchery, washing the setter twice yearly, 2 or more breeder farms providing eggs for the sampled flock, using low water pressure when washing the hatch trays, having more walk-in doors on the boiler house, the farmer removing the litter from the farm, concrete at most used door of the broiler house, the number of workers that work with the birds during grow-out, having more houses on the farm, standing water on the farm day 1, wood interior walls, a vegetation surface next the house footing, and 6 or less flocks on the litter. Protective factors included the use of footbaths and dedicated shoes, greater frequency of entering the house during brooding, disinfectant added to the drinker lines, having concrete outside the most used door, the cleanliness of the workroom, and harvesting birds at 56-63 days of age. The highest percent of variance occurred at the farm level meaning intervention efforts should focus on factors at the broiler farm level i.e. factors that are different among farms within a broiler complex.

Submitted by Rosangela Silva (rosangela.silva3@unioeste.br) on 2018-06-26T14:49:41Z No. of bitstreams: 2 Moacir_Dalmina_Junior.pdf: 4328726 bytes, checksum: 62b2315c55523ed5b1130daa6a03b4ce (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) / Made available in DSpace on 2018-06-26T14:49:41Z (GMT). No. of bitstreams: 2 Moacir_Dalmina_Junior.pdf: 4328726 bytes, checksum: 62b2315c55523ed5b1130daa6a03b4ce (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Previous issue date: 2018-03-09 / The high cost of production is one of the greatest challenges in poultry and the energy cost is one of the main factors for the final value of the product. So, the proposed study seeks to minimize and enhance the energetic lighting and ventilation system of broiler houses in the western region of Paraná state, Brazil. The objective of the present study was to develop a comparison of three design models of broiler houses to improve energy efficiency and environmental comfort of confined poultry. Thus the research analyzed two models of broiler houses existing in the market, the open-sided broiler house and the dark house models, in addition to a third model the proposed system that has as characteristics a brise-soleil system and cross ventilation, which uses natural resources to help in the thermal efficiency of the broiler house, minimizing energy costs and providing better animal comfort.Therefore, they result in a production gain, which helps the systems currently used. Thus, the study sought to develop a mixed system between project actions to better use of natural lighting and ventilation, as well as the use of electric heating and ventilation systems that have been used in commercial broiler houses. The models were developed using Autodesk Revit™ software, and the results were obtained through Green Building Studio™. The methodology used was the comparison of the models and analysis of the energy consumption of the buildings during the year. The outcome allowed us to conclude that the broiler house model proposed for this study was 20.97% more efficient than the open-sided model and 58.21% more efficient than the dark house model. / O alto custo de produção é um dos maiores desafios na avicultura de corte e o custo energético é um dos principais fatores pelo valor final do produto, por isso o estudo proposto busca minimizar e tornar mais eficiente energeticamente o sistema de iluminação e ventilação de aviários de corte no oeste do Paraná. O objetivo do presente estudo foi desenvolver uma comparação de três modelos de projeto para melhor eficiência energética e conforto ambiental de aves de cortes em confinamento. Assim a pesquisa analisou dois modelos de aviários existentes no mercado, o convencional aberto e o dark house, além de um terceiro modelo o sistema proposto que tem como características realizar um sistema de brises bloqueadores solares e de ventilação cruzada, que utilizem recursos naturais para auxiliar na eficiência térmica do aviário, minimizando custos com energia e proporcionando um melhor conforto dos animais. Desta forma resultem em ganho de produção, que vem servir de auxílio aos sistemas atualmente utilizados. Assim o estudo buscou desenvolver um sistema misto entre ações de projeto para melhor aproveitamento de iluminação e ventilação natural, mas com a utilização conjunta de sistemas elétricos de aquecimento e ventilação que atualmente são utilizados em aviários comerciais. Os modelos foram desenvolvidos através do software Revit da Autodesk, e os resultados foram obtidos através Green Building Studio. A metodologia utilizada foi a comparação dos modelos e análise do consumo energético das edificações durante o ano. Os resultados permitiram concluir que o modelo de aviário proposto para o estudo foi 20,97% mais eficiente que o modelo aberto convencional e 58,21% mais eficiente do que o modelo dark house.

Thesis (M.Sc. (Animal Production)) --University of Limpopo, 2018. / Refer to the document