Fungos do rúmen de bovinos e caprinos de corte no Norte de Minas Gerais

Abstract

The rumen fungi can assume fundamental importance in the digestion of tropical forages because they have mechanical and enzymatic skills that help in the degradation of cellulose and hemicellulose lignified. Few studies support the variation of the mycobiota present in the rumen due to the animal category and species and the profile of this population in animals raised in lignified tropical pasture or roughage-free diets. In this research, evaluated the characteristics of the ruminal fluid of different categories of Nellore cattle raised on pasture lignified, goats raised in the same conditions and without bulky hand fed steers. The delineation of the experiment was completely randomized. Immediately after collecting the ruminal fluid were evaluated physical and chemical characteristics. Micromorphological examination was carried out of the rumen juice, direct examination of strict anaerobes fungi and cultivation, quantitation, isolation and identification of aerobic fungi in the rumen. The yeast isolates were evaluated for their ability to assimilate different sources of carbon and nitrogen. It was found that the population of the rumen fungi differs according to the age of beef cattle raised on tropical pastures, as well as between bovine and goat specie raised extensively in the North of Minas Gerais. The biochemical profile of yeast on rumen environment of categories and species studied also differs from each other. Steers fed with and without forage for up to 71 days at different stages in the formation of rumen fungi.