40 fattening pigs (meat hybrid; category 25 40 kg) of both sexes were divided into two treatments for evaluation of fermentation process after zeolite supplementation in the feeding. The treatments consisted of the incorporation of 0 and 2% natural zeolite in the feed. After the period of diet adaptation (21 d), the faeces were collected. The levels of total nitrogen substances -crude protein (CP), ammonia (NH3), dry matter (DM), and volatile fatty acids were determined in the faeces. There

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... (fresh and dry basis) higher values of CP (59.5 and 53.0 vs. 230.7 and 224.2 g kg -1 ) and NH 3 (1.25 and 1.04 vs. 4.81 and 4.43 g kg -1 ) in the faeces from the group given zeolite, as well as superior values of dry matter (25.78% vs. 23.61%).