Rumen degradability in situ forage diet for Ruminants Formed by Hays Tifton 85 and Leucena

Abstract

We evaluated the nutritional value, as the chemical composition and in situ degradation of dry matter, crude protein and neutral detergent fiber. We adopted a completely randomized design (CRD), a 2 x 2 (hay Tifton 28 days 85 + 20% hay leucaena [FT28d +20 L], hay Tifton 28 days 85 + 40% hay Leucaena [FT28d +40 L], hay Tifton 42 days 85 + 20% hay leucaena [FT42d +20 L], hay Tifton 42 days 85 + 40% Leucaena hay [FT42d +40 L]) in split plot at 6, 24, 72 h. Hay Tifton 85 with two levels of regrowth x leucaena hay (20 and 40% of DM) resulted in degradation rate of DM c exceeding 3.0% / h, the soluble fraction of NDF increased level with 40% Leucaena hay, with the participation of fraction b, with the rate of degradation (c) exceeding 2.0% / h. The DM of Leucaena hay, were much soluble fraction (a = 33.59%) and little in situ degradable fraction (b = 32.59%), however, estimates of potential degradation rates of passage 2, 5 and 8% h-1 for the levels of food consumption low, medium and high of 60.07, 54.25 and 50.53% respectively. The Leucaena hay promotes an increase in protein content, increasing the CP content, the in situ and the kinetics of degradation of DM, CP, and 40% Leucaena hay.