TABLE 2.
Highest concentrations of phenolic monomers and tannins at which six tannin-tolerant ruminal bacteria and S. bovis JB1 grewa
| Strain | Highest concn at which bacteria grew
|
|||||||
|---|---|---|---|---|---|---|---|---|
| Pyrogallol (mM) | Phloroglucinol (mM) | p-Coumaric acid (mM) | Ferulic acid (mM) | Gallic acid (mM) | Tannic acid (g/liter) | Unpurified quebracho (g/liter) | Purified desmodium (g/liter) | |
| KN1 | 40 | 30 | 50 | 50 | 50 | 30 | 8 | 0.8 |
| KN2 | 30 | 30 | 30 | 30 | 30 | 2 | 4 | 0.7 |
| KN3 | 10 | 5 | 20 | 10 | 30 | 2 | 2 | 0.6 |
| KN4 | 5 | 5 | 5 | 5 | 10 | 2 | 8 | 0.4 |
| S. bovis JB1 | 5 | 5 | 5 | 5 | 5 | 0.2 | 1 | 0.002 |
| TW1 | 30 | 10 | 30 | 30 | 20 | 8 | 8 | 0.6 |
| TW2 | 20 | 20 | 20 | 20 | 20 | 2 | 8 | 0.5 |
a
Growth was defined as a change in A600 when inoculated medium was compared with a blank containing medium and the phenolic compound being studied. All tests were performed in defined medium (8).