ORIGINAL PAPER
In vitro gas production and degradation kinetics of elephant grass silage with dried tamarind residue
1
Federal University of São Francisco Valley, Department of Veterinary, Petrolina PE, 56306-410 Brazil
2
Federal University of Lavras,Department of Animal Science, Lavras MG, 37200-000 Brazil
3
Federal University of São Francisco Valley, Department of Animal Science, Petrolina PE, 56306-410 Brazil
4
Federal University of Bahia,Department of Animal Science, Salvador BA, 40170-110 Brazil
5
Semiarid Embrapa, Petrolina PE, 56302-970 Brazil
Publication date: 2016-08-25
Corresponding author
R. T. S. Rodrigues
Federal University of Lavras,Department of Animal Science, Lavras MG, 37200-000 Brazil
Federal University of Lavras,Department of Animal Science, Lavras MG, 37200-000 Brazil
J. Anim. Feed Sci. 2016;25(3):259-265
KEYWORDS
ABSTRACT
This study was conducted to evaluate fermentation, degradation
kinetics and gas production of elephant grass silages enriched with dried
tamarind (Tamarindus indica) residue (DTR). The experimental design was
4 × 7 factorial, with 4 inclusion levels of DTR (0, 8, 16 or 24% on an as-fed basis),
and 7 silo opening times (days 1, 3, 6, 12, 24, 48 and 60), and 3 replicates.
The kinetics of degradation and gas production were evaluated in the samples
of silages opened at day 60 by the semi-automatic in vitro gas production
technique. Silages with the inclusion of DTR showed lower pH values (P < 0.05)
until the day 6. The N-NH3 concentration did not differ (P > 0.05) between DTR
levels and silo opening times. The inclusion of DTR in the ensiling of elephant
grass increased silage dry matter (DM) content and caused a linear decrease (P
< 0.05) in all parameters evaluated for gas production. At each 8% increase
in DTR inclusion, the maximum total volume of gas production, gas production
rate from total carbohydrates and time of colonization decreased by 6.1 ml · g–1
of DM, 0.006 ml · g–1 of DM · h–1, and 2.4 h, respectively. However, the effective
degradability increased linearly (2.2%) at each 8% increase in DTR inclusion
(P < 0.05). In conclusion, it was observed that the 24% inclusion of DTR to
elephant grass silage provided a more rapid reduction in pH, reduced the in vitro gas production and increased DM degradability.
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