Produto com compostos fenólicos da própolis sobre parâmetros digestivos e ruminais, e população de protozoários em bubalinos

Abstract

The objective was to evaluate different doses of a product with phenolic compounds from propolis on total digestibility, passage rates for liquids and solids, ruminal parameters and protozoa population in feedlot buffaloes. It was used four crossbred female buffaloes with average weight of 543.9 ± 32.1 kg in a 4 x 4 Latin square with four diets and four periods. The product with phenolic compounds from propolis was provided in three doses, totaling four experimental treatments: CON:without addition of phenolic compounds; CF16: 16.95 mg of total phenolic compounds/day; CF33: 33.90 mg of total phenolic compounds/day and CF50: 50.85 mg of total phenolic compounds/day. The total mixed ration consisted of 80% corn silage and 20% concentrate, with 8.9% crude protein (CP) and 66% total digestible nutrients (TDN). The doses of the evaluated product did not influenced (P>0.05) totaldigestibility of dry matter and nutrients, passage rates for liquids and solids and microbial protein synthesis. Therefore, it was observed a quadratic effect (P<0.05) toacetate concentration and the diets CF16 e CF33 had a higher concentration of acetate compared to CON e CF50. There was a reduction in ruminal ammonia nitrogen concentration to the diets CF16 and CF50 compared to CF0. Linear correlation wasobserved (P <0.05) on the population of ciliated protozoa of the genus Entodinium, with higher reduction of protozoa with increasing doses. It can be concluded that thephenolic compounds from propolis promote reduction in the population of rumenciliated protozoa of the genus Entodinium in buffaloes and reduction of the NH3-Nconcentration in the rumen fluid.l.