Effect of Tamarind (Tamarindus indica) Seed Tannin on In vitro Biomass Production and Substrate Degradation of Aerobic Rice Straws
2014
Ananth, Deepa | Krishnamoorthy, U. | Singh, K Chandrapal | Gloridoss, R.G.
Three aerobic varieties of rice straw IR-64, IR-36 and IR-30864 differing in their composition and rate of substrate degradation were incubated without or with 5 and 7.5% of tamarind seed testa (TST) to evaluate the effect of tannin on ruminal biomass production. Semi-purified tamarind seed tannin containing total phenolic content of 51.73% tannic acid (TA) equivalence, total tannin of 31.75% TA equivalence and condensed tannin of 23.32% leucocyanidine equivalent, degrading with a total gas production of 100 ml at a rate of 0.0306 mg/min was used for the study. The (TST) supplementation (P<0.01) reduced the potential gas production, prolonged the rate of substrate degradation in all the three varieties. The halflife was prolonged by 2h in IR-64 and IR-36 variety and 6h in IR-30864 variety. Incubation of straw varieties with TST at t₁/₂ period of respective straws, showed significant (P<0.01) increase of rumen microbial biomass production in terms of RNA equivalence. Significant linear reduction in gas production was observed in all the varieties with increasing level of TST. The efficiency of rumen biomass production were increased (P<0.01) in all the varieties with TST addition. The total SCFA contents were low in all the varieties of straw with addition of either 5 or 7.5% TST with resultant variations in the concentration of propionate and butyrates. Inclusion of tamarind seed testa at 5 and 7.5% to aerobic straws produced a shift in the fermentation pattern towards more microbial biomass, and less of gas and SCFA production, increased efficiency of biomass production along with higher propionate and lower butyrate and isobutyrate production.
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