Avaliação do desempenho e da toxicidade em ovinos mantidos em pastagens de Brachiaria decumbens, Brachiaria brizantha, Panicum maximum var Aires e Andropon gayanus var Planaltina

AUTOR(ES)

Cristiane Vinhaes Gracindo

DATA DE PUBLICAÇÃO

2010

RESUMO

Due to the increasing deployment of Brachiaria spp in the soil of the Midwest, this project aims to evaluate the toxicity and performance of sheep grazing Brachiaria decumbens and Brachiaria brizantha, compared with Panicum maximum var Aires and Andropogon gayanus var Planaltina pastures. The presence of clinical signs of poisoning by Brachiaria spp and serum biochemical parameters: aspartate aminotransferase (AST), gamma-glutamyltransferase (GGT), total protein (TP), albumin, urea and creatinine were evaluated. The levels of saponins and Pithomyces chartarum spores in pasture samples were also evaluated. The experiment used 48 animals divided into homogeneous lots consisting of castrated males, average weight 20 kg, aged between four and five months, coming from herds with no previous contact with Brachiaria spp. for more than three consecutive years and naive animals, i.e., that never had contact with Brachiaria spp. The animal performance was similar in sheep kept in paddocks with B. decumbens, B. brizantha and P. maximum var Aires, but lower in the group that remained in the area formed by A. gayanus var Planaltina (p ≤ 0.05). Animals with previous contact Brachiaria spp. showed no clinical signs consistent with poisoning from the ingestion of forage. However, two naive animals kept in the paddock of B. decumbens, were intoxicated, and one of them died, suggesting a possible form of adaptation of animals to grazing on Brachiaria spp., which gives them some degree of resistance to poisoning.

ASSUNTO(S)

saponina brachiaria decumbens saude animal (programas sanitarios) sheep ovino saponin brachiaria decumbens

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