Influence of Aspergillus oryzae administration on milk yeld and quality of Italian River Buffalo.

The administration of Aspergillus oryzae (AO) in bovine gave contradictory results related to its effect on the yields. In order to verify the AO administration effect on lactating buffaloes were established two experimental groups each of 14 buffaloes multiparous homogeneous for yield level and milk composition (pH, DM, fat, proteins, lactose and urea). The treated group (T) received, besides the unifeed, a mix containing an AO fermentation extract, while the untreated group (C) received only the unifeed. The period of lactation was divided in 5 intervals (A, B, C, D and E). During the first 100 days the yields of group T was lower than C group even if not significantly. In the third interval there were no differences between the two groups and in the intervals D and E the yield was overlapping. Only significant differences (P<0.05) were observed related to urea concentration higher for the T group. This behaviour could be due to the decrease proteins degradability consequently to the AO administration. The higher value in fat contents for the T group gave no significant difference as well as the contents of lactose and proteins. The AO administration implied a decrease of yield, even if no significant, in the first 100 days likely ascribed to a modification of food retention time into the intestinal tract.