População fúngica aeróbia ruminal de ovinos recebendo torta de macaúba

Abstract

Fungi from the ruminal environment could present promising potential to degrade plant fibrous components. The objective in this study was to evaluate the effects of the levels of macauba meal (MM) in the diet of lambs, on the population of aerobic rumen fungi. Twenty-four Santa Inés lambs were distributed in a randomized block design with four treatments and six replications. The treatments were 0, 100, 200 and 300 g/kg of TM. Aliquots of 100 μL of ruminal fluid were inoculated into the sterile plates containing agar Sabouraud medium. The growth colonies were monitored for seven days and the identification of mycelial fungi was performed by microculture of 45 isolates from rumen fluid. Increased levels of MM in the diet resulted in higher (P<0.01) concentration of mycelial fungi and reduction (P<0.01) of the yeast population. Higher genera diversity of mycelial fungi from lambs fed with lower levels of MM was observed. The most frequent genus for 200 and 300 g/kg inclusions was Aspergillus that could be contributing to fiber digestibility of the MM.