Avaliação clínico-laboratorial,histopatológica hepática e desempenho de ovinos alimentados com feno de braquiária ou cana-de-açúcar
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Data
2009-03-03
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Universidade Federal de Goiás
Resumo
The species of Brachiaria are important forages from Brazilian tropical regions,
mainly the Central-Western region. Some species of Brachiaria have been
described as cause of hepatogenous photosensitization in ruminants. Initially, the
disease was attributed to the fungus Pithomyces chartarum, but recent studies
suggest that the steroidal saponins present in the grasses have toxic principles
responsible for the photosensitization. The objective of this study was to evaluate
the hepatic function and the performance of lambs fed with B. brizantha hay or
sugar cane (Saccharum officinarum L.), by means of clinical examination,
laboratory tests, and macro and microscopic analysis of the liver. Twelve Saint
Ines lambs were used. The animals were divided into two experimental groups:
group hay (six lambs fed with roughage of B. brizantha hay and concentrate) and
group sugar cane (six lambs fed with roughage of sugar cane and concentrate).
The hay used to feed the lambs did not contain Pithomyces chartarum spores. The
clinical examinations occurred at each seven days, the laboratory tests at each 14
days, and the weighings at each 28 days. At the end of 93 days of experiment the
lambs were slaughtered, the macroscopic analysis of the the organs was carried
out, and the liver fragments were collected for the microscopic analysis. The lambs
were clinically healthy, during the whole period, except at the beginning of the
experiment, when some animals presented pneumonia. The only biochemistry
alterations suggestive of hepatic damage were the increase of the GGT values
and the decrease of total cholesterol in both groups. No animal fed with B.
brizantha hay presented macroscopic alteration in the liver. The microscopic
analysis of the liver revealed preserved hepatocytes and presence of multifocal
infiltration of mononuclear inflammatory cells in the hepatic parenchyma and also
in the portal triads, characterizing cholangitis in both groups. Degenerations
suggestive of hepatic esteatosis were observed in four animals fed with sugar
cane. Feeding lambs with B. brizantha hay promoted similar performance than
feeding the animals with sugar cane. Regardless of the type of feeding, the lambs
presented, as biochemistry alteration of the hepatic function, increase of the serum
levels of GGT and decrease of total cholesterol, followed by histological
alterations, characteristic of light cholangitis.
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Citação
LIMA, Flávia Gontijo de. Clinical-laboratorial, hepatic histopathological and perfomance evaluation of ovine fed with B. brizantha hay or sugar cane (Saccharum officinarum L.). 2009. 75 f. Dissertação (Mestrado em Ciências Agrárias - Veterinaria) - Universidade Federal de Goiás, Goiânia, 2009.