Avaliação do resíduo de tucumã (Astrocaryum aculeatum) na alimentação de ruminantes

Abstract

The objective was to evaluate the Tucumã bark residue (Astrocaryum aculeatum) as a potential by-product for feeding ruminants. In experiment 1: The bromatological chemical composition, carbohydrate and protein fractionation of the Tucumã peel residue were determined. Experiment 2: The in situ degradability of Tucumã bark residue was carried out using a crossbreed buffalo (Murrah/Jafarabadi) fistulated in the rumen. In Experiment 03: the quality of BRS Capiaçu silages was analyzed with different levels of inclusion of tucumã skin. The Tucumã bark residue presented the following values for: dry matter (DM) 87.5%, crude protein (CP) 10.1%, ether extract (EE) 10.5%, ash 5.8%, organic matter (MO) 94.2%, neutral detergent fiber (NDF) 70.4% and acid detergent fiber (ADF) 48.3%. The Tucumã residue presented 18%, 0.4% and 81.6%, for fractions A+B1, B2 and C of MS, respectively. However, regarding protein fractions, the following values were observed: 81.4%, 15.22%, 0.25% and 3.13% for fractions A, B1+B2, B3 and C, respectively. In terms of degradability, the Tucumã residue presented around 6% in fraction “A” of dry matter (DM) and 42.61% of CP, in fraction “b” it presented around 19.15% of DM and 11.31% of CP , in fraction “c” obtained the highest value, being 74.11% in and 46.08% in PB. Tucumã residue has low degradability in the rumen. The potential degradability of MS was 25.89% and PB was 53.92%, the effective degradability taking into account the passage rate of 2%, 5% and 8% were 21.58% 17.84% and 8% from MS and 49.01%, 46.48% and 45.39% from PB. There was a significant difference in the chemical composition of the silage (P < 0.05). Tucumã bark was not efficient in sequestering moisture with an increase in PMS. And when the silos were opened, the treatments maintained aerobic stability up to 72 hours after opening, with no difference between the treatments in relation to the control. Tucumã bark can be used as a source of non-degraded fiber, NNP and energy in the form of EE. The addition of tucumã peel increased the DM of BRS Capiaçu silage, but did not reduce the PMS and there was no change in aerobic stability.