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This research evaluated, using the in situ technique, the dry matter and fiber fraction degradability of the Mineirão stylo (Stylozanthes guianensis). The nylon bag method was used for the degradability assay, with two incubations in rumen-cannulated adult female cows. In each incubation, 25 samples of 7.0 g each were used. The samples were collected at 0, 6, 9, 12, 24, 36, 48, 72 and 96 hours. The experiment was conducted according to a randomized blocks design and data were submitted to analysis of variance. The maximum effective degradability was obtained in the 2% passage rate. For the 5% passage rate the Mineirão stylo showed effective degradation of 75.70% for dry matter, 59.01% for neutral detergent fiber and 76.81% for acid detergent fiber. The digestibility achieved by the dry matter and fibrous fraction from Mineirão was considered high. These results, coupled with the low lag time found reveal the forage potential of the cultivar.  Neste trabalho avaliou-se, por meio da técnica in situ, a degradabilidade da matéria seca e da fração fibrosa da leguminosa estilosantes Mineirão (Stylozanthes guianensis), leguminosa nativa do Cerrado brasileiro. Para o ensaio da degradabilidade, usou-se o método dos sacos de náilon, com duas incubações em fêmea bovina adulta canulada no rúmen. Em cada incubação, foram utilizadas 25 amostras de 7,0 g cada. As amostras foram retiradas nos tempos 0, 6, 9, 12, 24, 36, 48, 72 e 96h. O experimento foi conduzido segundo o delineamento de blocos ao acaso e os dados submetidos à analise de variância. As máximas degradabilidades efetivas foram atingidas na taxa de passagem 2%. Para a taxa de passagem de 5%, o estilosantes Mineirão apresentou degradabilidade efetiva de 75,70% para a matéria seca, 59,01% para a fibra em detergente neutro e 76,81% para a fibra em detergente ácido. A digestibilidade alcançada tanto pela matéria seca quanto pela fração fibrosa estilosantes Mineirão foi considerada alta. Estes resultados, aliados ao baixo tempo de colonização lag time encontrado revelam o potencial forrageiro da cultivar

In situ dry matter and fiber fraction degradability of the Mineirão stylos - doi: 10.4025/actascianimsci.v34i2.13138