Many studies evidenced that the possibility of using forages and other grasses as feedstuffs in swine production. However, there is a need to study the potential fibrous feedstuffs in swine production in terms of identification, quantification and evaluation of interactions between physiological and associative effects on digestibility and animal performance. Hence, the objective of the present study was to evaluate the apparent digestibility of Tifton-hay, Citric Pulp and Soybean hulls in finishing pig diets. Twenty crossbred barrows (70 ± 1.95 kg) were distributed in a randomized block design with 4 treatments (n = 5) fed 20% replacement of fibrous diets on basal diet, Group I- 100% basal diet; Group II- 80% basal diet +20% Tifton hay; Group III- 80% basal diet +20% Citric pulp and Group IV- 80% basal diet +20% Soybean hulls, in individual metabolism cages. Apparent digestibility of Dry Matter and nutrients was performed by total feces and urine collection method for pigs, which animals were housed in metabolism cages for 12 d (7 d for acclimation and 5 d for collection). Feeds and feces were analyzed for dry matter (DM), crude energy (CE), crude protein (CP), neutral detergent fiber (NDF) and acid detergent fiber (ADF). Our result shows that Tifton hay had 2.425 kcal/kg of apparent digestible energy and 3.36% of apparent digestible protein. In addition, apparent digestibility of NDF and ADF of Tifton hay were 28.47 and 22.63% respectively. However, the results for Citric pulp were 2.850 kcal/kg of apparent digestible energy, 1.47% of apparent digestible protein and also apparent digestibility of NDF and ADF, were 8.14 and 7.85%. Soybeans hulls showed 2.250 kcal/kg of apparent digestible energy, 7.85% of apparent digestible protein and apparent digestibility of NDF and ADF were 21.7 and 26.39%, respectively. Therefore, our present study concluded that fibrous sources were used like feedstuffs in finishing pig diets. Moreover, it confirms that fibrous feeds will be both nutritionally and economically beneficial to swine production. The authors thank for the support of CNPq and FAPEAM.