Evaluation of coffee grain (Coffea arabica L.) hulls and dehydrated pulp in vitro degradability using the gas production technique
Hull and dehydrated pulp of coffee cultivars Catuai, Rubi and Mundo Novo from Brazil were obtained by moist pulping in a mechanical pulper and dried up to 13 percent moisture content. The materials were stored in raffia bags under a ventilated, moistureless environment and sun sampled every 90 days. Four hundred milligrams of each sample (DM and NDF) were incubated in vitro in triplicates in a water bath at 39°C. The cumulative gas production was obtained at 1, 2, 3, 4, 5, 12, 18, 24, 30, 36, 48, 60 and 72h of incubation. The kinetics of the cumulative gas output for DM and NDF were determined using the model Vt=Vt1/(1+exp(2+4m(L-T))), and SDN, by the model Vt=Vt1 x (1-exp(-m x T)). Cumulative gas production of the SDN fraction was obtained by the difference between the cumulative production of DM and NDF. Storage of hull and dehydrated coffee pulp improved the degradation rate, reduced the fibrous and undegradable fractions, and released soluble sugars for the ruminal flora. For coffee hulls of all cultivars, the maximum fermentation contribution of SDN and NDF took place around 24 and 48 h, respectively. The maximum gas production in pulp DM occurred between 48 and 60 h in all cultivars and was a consequence of the maximum gas production by the NDF fraction, which peaked around 60 h. Long colonization period may be a limitation to the use of hull and dehydrated coffee pulp in ruminant feeding, impairing the feed utilization of ruminal microorganisms due to the rapid passage through the rumen.
| Main Authors: | , , , , |
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| Format: | biblioteca |
| Published: |
2001
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| Subjects: | CAFE, COFFEA ARABICA, PULPA DE CAFE, VARIEDADES, DIGESTIBILIDAD, CONTENIDO DE MATERIA SECA, FERMENTACION, CASCARAS, DIGESTION RUMINAL, ALMACENAMIENTO, BRASIL, |
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