The trial was performed on 36 goats (50.3 ± 2.6 kg body weight) having free access to pasture, constituted by 60% Leguminosae and 40% Graminee, equally divided into three groups (CTR, SC, AS) homogeneous in parity and milk production at the previous lactation. Concentrate of groups SC and AS was supplemented with 20 g/head/day of Saccaromyces cerevisiae and Aspergillus oryzae fermentation extract plus Saccaromyces cerevisiae respectively, while group CTR was CTR was not supplemented and was used as control. Average milk yield did not differ statistically among the groups (g/head/day 1480 vs 1630 vs 1630 for CTR, SC and AS, respectively). By contrast, milk fat percentage was significantly (P