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The objective of this work was to evaluate the ruminal degradability of dry matter (DM), crude protein (CP), neutral detergent fiber (NDF) and acid detergent fiber (ADF) of the oat hay (OH), Coast cross hay (CCH), pellet Esmeralda grass hay (PEH) and Esmeralda grass hay (EH). The in situ technique was used, with four bovines, castrated, rumen fistulated, distributed in an Latin square 4x4 experimental design. The material was incubated in the rumen in the times 0, 6, 24, 48, 72 and 144 hours. There was no difference between hays on the degradation rate (c, %/h) for the CP, NDF and ADF. For the DM, the OH and PEH presented higher degradation rate. There was difference on the effective degradability (ED, %) of the hays, and the observed values were: OH, 48.74%; PEH, 42.44%; EH, 35.13%; CCH, 30.24%. It can be concluded that oat hay presented the highest values for the soluble fraction and for the ED of all nutrients evaluated. The pellet process of the Esmeralda grass resulted in higher ED of the DM and of the fiber, with no alteration on the CP ED.<p><p>O objetivo deste trabalho foi avaliar a degradabilidade ruminal da matéria seca (MS), proteína bruta (PB), fibra em detergente neutro (FDN) e fibra em detergente ácido (FDA) do feno de aveia (FA), feno de Coast cross (FCC), feno de grama Esmeralda peletizado (FEP) e feno de grama Esmeralda (FE). Foi utilizada a técnica in situ com quatro bovinos machos, castrados, fistulados no rúmen, distribuídos em um delineamento experimental em quadrado latino 4x4. O material foi incubado no rúmen nos tempos de 0, 6, 24, 48, 72 e 144 horas. Não houve diferença entre os fenos na taxa de degradação (c, %/h) para a PB, FDN e FDA. Para a MS, o FA e FEP apresentaram maior taxa de degradação. Houve diferença na degradabilidade efetiva (DE) da MS dos fenos sendo os valores observados: FA, 48,74%; FEP, 42,44%; FE, 35,13%; FCC, 30,24%. Conclui-se que o feno de aveia obteve maiores valores para a fração solúvel e maior degradabilidade efetiva para todos os nutrientes avaliados e a peletização da grama Esmeralda promoveu maior DE da MS e da fibra, sem alterar a DE da PB

Degradabilidade ruminal dos fenos de aveia (Avena sativum L), Coast cross (Cynodon dactilon L.), e grama Esmeralda (Joysia japonica) peletizado ou não