The objective of this study was to evaluate the digestibility of nutrients after the inclusion of pineapple (Ananas comosus L.), banana (Musa sp.), mango (Mangifera indica) and passion fruit (Passiflora sp.) residue, in diet for confined sheep, replacing 75% corn silage. Twenty-five Santa Ines crossbred sheep male, rumen fistulated, castrated were used with initial age of 24 mo and initial body weight of 45.4 ± 6.1 kg. Experiment was conducted in Latin square design (5 × 5), with 5 treatments, 5 animals, and 5 experimental periods with 13 d each. The forage: concentrate diet was 40:60 (% dry matter), and the forage in the control diet was composed of 100% corn silage. At 13th day of each experimental period, rumen fluid samples were collected via ruminal fistula, to determine pH, and ammonia nitrogen (NH₃-N) in the following collections times: 0h (immediately prior the morning feeding), 2, 4, 6 h and 8 h after the morning feeding. Data collection was analyzed by regression, and to compare control diet with treatments, was performed by Dunnett test at 5% probability, using the Statistical Analysis System. There was no effect (P > 0.05) on the ammonia concentration levels (N-NH₃) in rumen fluid of animals fed with fruit residue, and obtained as an average value of 21.52 mg dL⁻¹. In the different collections (0, 2, 4, 6 and 8 h) of ruminal fluid was observed a quadratic effect (P < 0.05) for N-NH₃ (N-NH₃ = 19.64 + 3,11t −0,44t2; R2 = 0.63), where the highest concentration at this time was at 3.53 h post-treatment, which may be related to the lower diets fibrousness. Diet containing pineapple residue presented lowest (P < 0.05) pH value, with an average between 6.13 collection times. Quadratic effect was observed (P < 0.05) for pH (pH = 6.40 - 0,10t + 0,011t2; R2 = 0.61) as rumen fluid collection time, with lowest value of pH occurred at 4.54 h post-treatment. We conclude that the use of all fruits residue do not decrease the amount of N-NH₃ available for rumen microorganisms, and not interfere with the pH of rumen fluid suitable for the microbiota.