Table 4.
Effects of steam conditioning time for flaked corn on starch availability, ISDMD, and production of fermentative gasses by in vitro cultures of mixed ruminal microbes (IVGP)
| Conditioning time, min | P-value | |||||
|---|---|---|---|---|---|---|
| Item | 15 | 30 | 45 | SEM | Linear | Quadratic |
| Starch availability, %1 | 48.5 | 51.5 | 47.9 | 0.60 | 0.52 | <0.01 |
| ISDMD, %2 | 36.6 | 44.4 | 42.0 | 2.66 | 0.15 | 0.12 |
| IVGP, mL3 | 102.3 | 121.3 | 104.9 | 7.33 | 0.57 | <0.01 |
1Measured using the refractive index method (Sindt et al., 2006b) once per sample (90 observations, 30 per treatment) shortly after flaking.
2Measured over 3 d using six ruminally fistulated steers by incubating 2.5 g (DM) corn flakes in Dacron bags ruminally for 14 h (270 observations, 90 per treatment).
3Mean gas production during 24-h incubation period. Measured by incubating 3 g (DM) flaked corn as substrate, with 10 mL ruminal fluid inoculum and 140 mL McDougall’s Buffer at 39 °C. Repeated with two replicates per sample (90 samples, 180 observations, 60 per treatment).