2017-11-292017-07-31CERQUEIRA, Aline Barichello. Doença respiratória em bovinos confinados: aspectos patológicos e de desempenho produtivo. 2017. 54 f. Dissertação (Mestrado em Ciência Animal) - Universidade Federal de Goiás, Goiânia, 2017.http://repositorio.bc.ufg.br/tede/handle/tede/7999The study consisted in two experiments at beef cattle feedlot in Goias state. The first analyzed the influence of macroscopic and histopathological changes in hot weight carcass (PCQ) of cattle. At the slaughter line, lungs were macroscopically evaluated and samples were collected for histopathological examination. Statistical analysis was performed by means of the analysis of variance and Tukey's test, with a significance level of 5%, comparing the PCQ values of the groups with lesions (CL) and without lesions (SL). Total of 2129 lungs were inspected, and 12.78% were identified with macroscopic alterations. The mainly pneumonias identified were fibrinous bronchopneumonia (4.78%), suppurative bronchopneumonia (4.04%), granulomatous pneumonia (3.68%) and interstitial pneumonia (1.47%). The PCQ values did not present significant differences (p> 0,05) between the CL and SL groups and were not influenced by macroscopic and histopathological changes. In the second article, the influence of dry (PS) and rainy (PC) periods on the macroscopic and histopathological pulmonary alterations and the average daily gain (GPD) of cattle were analyzed. At the slaughter line, the lungs were evaluated in the PS and PC periods. A macroscopic evaluation of the lungs was performed, and samples were collected for histopathological examination. Statistical analysis was performed using Tukey's test, with a significance level of 5%, to evaluate the effect of pulmonary lesions on the GPD. In order to evaluate the association of lesion frequency with the stations, a regression was performed considering a multinomial linear generalized model. Of the animals evaluated, 15.92% and 23.15% had macroscopic lung alterations in PS and PC, respectively. Among the pneumonias identified, the fibrinous bronchopneumonia (8,21%) predominated in the PS and suppurative bronchopneumonia (14,28%) in the PC. The PC had a higher frequency of macroscopic and histological lung lesions than PS. The lesions were predominantly mild to moderate and of low frequency and, therefore, did not significantly influence the GPD of confined cattle.application/pdfAcesso AbertoBovinoConfinamentoFatores meteorológicosPatologia pulmonarPerformance produtivaCattleFeedlotLung lesionsMeteorological factorsProductive performanceMEDICINA VETERINARIA PREVENTIVA::SAUDE ANIMAL (PROGRAMAS SANITARIOS)Dissertação