Table 5.
Liver and lung scores of steers fed 0.5 g/steer/day Bacillus subtilisPB6 (CLOSTAT 500) compared with non-supplemented control steers.
| Item | Dietary treatment1 | P-value | |
|---|---|---|---|
| CON | CLO | ||
| Livers, n | 972 | 997 | |
| Liver abscess scores2 | |||
| Edible, % | 80.04 | 79.47 | 0.76 |
| Abscessed, % | 8.69 | 8.54 | 0.90 |
| Abscess severity distribution | |||
| A−, % | 4.13 | 4.88 | 0.43 |
| A, % | 1.06 | 0.40 | 0.11 |
| A+, % | 3.50 | 3.27 | 0.74 |
| Lungs, n | 954 | 990 | – |
| Lung consolidation score3 | |||
| 1, % | 17.82 | 16.76 | 0.56 |
| 2, % | 13.76 | 12.64 | 0.54 |
| 3, % | 7.78 | 7.92 | 0.57 |
| Lung fibrin score | |||
| Minor, % | 14.51 | 13.31 | 0.44 |
| Extensive, % | 14.82 | 12.40 | 0.13 |
| Lung status | |||
| Normal, % | 32.30 | 34.97 | 0.18 |
| Abnormal, % | 46.22 | 43.04 | 0.18 |
| Condemned, % | 21.38 | 21.68 | 0.99 |
| Inflated, % | 0.31 | 0.62 | 0.41 |
1CON = control, standard finishing diet; CLO = CLOSTAT steers fed control diet supplemented with 0.5 g/hg/d Bacillus subtilis PB6(CLOSTAT500, Kemin Industries, Des Moines, IA), administered through the micro-ingredient machine.
2Severity of liver abscesses scoring system was the following: A− (one or two small abscesses); A (two to four well-developed abscesses, less than 2.54 cm diameter); A+ (one or more large active abscesses, greater than 2.54 cm in diameter with inflammation of surrounding tissues.
3Lung consolidation scores include: 1 = 0–15% consolidation of tissue; 2 = 15–50% consolidation of tissue; 3 = >50% consolidation or tissue or portion of lung missing.