Submitted by Franciele Moreira (francielemoreyra@gmail.com) on 2017-11-29T12:57:51Z No. of bitstreams: 2 Dissertação - Aline Barichello Cerqueira 2017.pdf: 4495463 bytes, checksum: 7ef02ea5cb5e35bb417877cf83766a80 (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) / Approved for entry into archive by Luciana Ferreira (lucgeral@gmail.com) on 2017-11-29T13:27:19Z (GMT) No. of bitstreams: 2 Dissertação - Aline Barichello Cerqueira 2017.pdf: 4495463 bytes, checksum: 7ef02ea5cb5e35bb417877cf83766a80 (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) / Made available in DSpace on 2017-11-29T13:27:20Z (GMT). No. of bitstreams: 2 Dissertação - Aline Barichello Cerqueira 2017.pdf: 4495463 bytes, checksum: 7ef02ea5cb5e35bb417877cf83766a80 (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Previous issue date: 2017-07-31 / The 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. / O estudo foi dividido em dois experimentos com bovinos confinados no estado de Goiás. O primeiro analisou a influência das alterações pulmonares macroscópicas e histopatológicas no peso de carcaça quente (PCQ) de bovinos. Na linha de abate, foram avaliados os pulmões de bovinos machos provenientes de dois confinamentos e avaliou-se macroscopicamente pulmões e coletou-se amostras para exame histopatológico. A análise estatística realizou a comparação das médias de PCQ dos grupos com lesão (CL) e sem lesão (SL) pela análise de variância e teste de Tukey, com grau de significância de 5%. Foram inspecionados 2129 pulmões e identificaram 12,78% com alterações macroscópicas. As principais pneumonias identificadas foram: broncopneumonia fibrinosa (4,78%), broncopneumonia supurativa (4,04%), pneumonia granulomatosa (3,68%) e pneumonia intersticial (1,47%). Os PCQ dos animais não apresentaram diferenças significativas (p>0,05) entre os grupos CL e SL, não sendo influenciadas pelas alterações pulmonares macroscópicas e histopatológicas. No segundo artigo foi analisada a influência dos períodos seco (PS) e chuvoso (PC) nas alterações pulmonares macroscópicas e histopatológicas e no ganho de peso diário (GPD) de bovinos confinados. Na linha de abate, foram avaliados os pulmões de bovinos machos, nos períodos PS e PC. Foram realizadas a avaliação macroscópica dos pulmões e coletada amostras para exame histopatológico. A análise estatística realizou análise de variância e teste de Tukey, com grau de significância de 5%, para avaliar o efeito das lesões pulmonares no GPD e, para avaliar da associação da frequência de lesões com as estações, realizou regressão considerando modelo linear generalizado multinomial. Dos animais avaliados, 15,92% e 23,15% apresentaram alterações pulmonares macroscópicas no PS e PC, respectivamente. Dentre as pneumonias identificadas, a broncopneumonia fibrinosa (8,21%) predominou no PS e a broncopneumonia supurativa (14,28%) no PC. O PC apresentou maior frequência de lesões macroscópicas e histológicas pulmonares, quando comparado ao PS. As lesões foram, predominantemente, de intensidade leve a moderada e de baixa frequência e, portanto, não influenciaram significativamente no GPD de bovinos confinados.