Enfermidades rumenais, hepáticas e podais em bovinos confinados
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Data
2017-07-28
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Universidade Federal de Goiás
Resumo
The search for increasing the productivity and the quality, along the reduction the cost of production, is an unarguable need of the different systems for raising cattle. Besides that, the use of high-grain diet has become an indispensable tool for animal nutrition. On the other hand, such diet may cause an unbalance between the production and removal of volatile fatty acids in the rumen leading to a ruminal acidosis. Ruminal acidosis may result in lesions in the ruminal walls, contributing for the colonization and multiplication of bacteria, frequently leading to liver abscesses, rumenitis and claw lesions. This paper aims at describing the interrelation among liver abscesses, ruminal and claw lesions of bovine in a post mortem evaluation. The cattle was raised on pasture for 17 to 27 months. 90 days before slaughter, they were taken to feedlots. 1060 bovine were macroscopic evaluated while 98 were microscopically. Statistical analysis were performed using Pearson´s Qui-square. The macroscopic and microscopic analysis were classified in six scores, meaning one for animals without a lesion and five for the ones which had a lesion in their rumen. 328 lesions were found in 300 bovine (28.3%), that is, 88 (8.3%) had claw lesion, 10 (0.9%) showed liver abscesses and 230 (21.7%) presented rumenitis. None of the animals was simultaneously diagnosed with the three aforementioned lesions. 28 presented two different lesions: 26 (2.45%) had ruminal and claw lesions while 2 (0.19%) showed rumenal lesion and liver abscess. The microscopic evaluation of the rumen pointed out alterations in 21 (21.6%) slides. 16 animals presented discreet rumenitis, 2 had mild rumenitis and 2 showed chronic rumenitis. One animal had its rumen to be in a healing process. Out of the 98 rumen analyzed macroscopic and microscopically, 23 had macroscopic lesion while 10 presented the same alterations found microscopically: 7 diagnosed with hyperkeratosis, 2 with hyperemia and 1 ulcer case. The post mortem evaluation showed no interrelation of occurrence among rumenitis, liver abscess and claw lesion in Nelore bovine raised on a pasture up to 90 days before slaughter. The microscopic analyzes revealed ruminal lesions which were not identified in a macroscopic evaluation. It proved to be an extra resource for diagnosing the phase of rumenal lesions.
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Palavras-chave
Acidose rumenal , Bovinos , Confinamento , Fígado , Locomotor , Ruminal Acidosis , Cattle , Feedlot , Liver , Locomotor
Citação
VIANA FILHO, P. R. L. Enfermidades rumenais, hepáticas e podais em bovinos confinados. 2017. 50 f. Dissertação (Mestrado em Ciência Animal) - Universidade Federal de Goiás, Goiânia, 2017.