| Summary: | Abstract This study was part of a project (Grasas By Pass), funded by Ciencias Pecuarias ESPOCH. Samples from Chimborazo and Tungurahua were analyzed. The statistical analysis included descriptive analysis and significance tests, including Tukey test. The following results of ranges were found in the first phase: humidity: 7.79% ( ± 0.06) – 9.99% ( ± 0.08); ashes: 9.16% ( ± 0.14) – 10.50% ( ± 0.01); protein: 18.73% ( ± 0.10) – 21.37% ( ± 0.52); crude fiber: 31.64% ( ± 0.26) – 41.69% ( ± 0.11); ethereal extract: 1.36% ( ± 0.22) – 2.13% ( ± 0.50); and ELN: 28.30% ( ± 0.09) – 34.46% ( ± 0.24). The results from the second phase were: F.D.N.: 41.39% ( ± 1.32) – 51.77% ( ± 0.01); F.D.A.: 37.36% ( ± 0.26) – 45.47% ( ± 1.04); and L.D.A.: 7.85% ( ± 0.48) – 9.30% ( ± 0.39). In vivo digestibility tests were developed in metabolic cages with six sheep per treatment for 11 days. The following results were found: Dry matter digestibility coefficient (C.D.M.S.): 60.78% – 66.42%; organic matter (C.D.M.O.): 61.97% – 68.24%; protein (C.D.P.B.): 74.35% – 80.23%; crude fiber (C.D.F.C): 43.73% – 59.39%; ethereal extract (C.D.E.E.): 26.56% – 51.76%; and E.L.N. (C.D.ELN): 67.26% – 81.96%. Finally, the Van Es equations were applied to estimate the values of E.M., E.Nl., E.Ng. and N.D.T. The digestibility and energy coefficients for the hay from Chimborazo - San Juan were higher, and there were lower values for Tungurahua – Cunchibamba.
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