Table 2.
Animal accountability, morbidity, and mortality 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 | ||
| Day 0 steers, n | 1,050 | 1,050 | – |
| Morbidity | |||
| Total first pull, n (%) | 141 (13.43) | 109 (10.38) | 0.03 |
| Acute interstitial pneumonia | 1 (0.10) | 4 (0.38) | – |
| Bloat | 3 (0.29) | 1 (0.10) | – |
| Buller | 1 (0.10) | 1 (0.10) | – |
| Lame | 5 (0.48) | 5 (0.48) | – |
| vOther2 | 9 (0.86) | 6 (0.57) | – |
| Pneumonia | 122 (11.62) | 91 (8.67) | – |
| Prolapse | 0 (0.00) | 1 (0.10) | – |
| Respiratory morbidity | |||
| 1st treat, % | 134 (12.76) | 96 (9.14) | <0.01 |
| 2nd treat, % | 35 (3.33) | 22 (2.10) | 0.03 |
| Respiratory Observe3, n (%) | 1.90 | 2.19 | 0.64 |
| Temperature, 1st treatment, °C | 40.44 | 40.38 | 0.19 |
| Mortality, n (%) | 33 (3.14) | 24 (2.29) | 0.23 |
| Digestive, n | 9 (0.86) | 6 (0.57) | 0.44 |
| Other2 | 4 (0.38) | 5 (0.48) | 0.74 |
| Respiratory, n | 20 (1.90) | 13 (1.24) | 0.22 |
| Removed, n (%) | 40 (3.18) | 29 (2.76) | 0.18 |
| Buller, n | 2 (0.19) | 0 (0.00) | 0.99 |
| Digestive, n | 1 (0.10) | 0 (0.00) | 0.99 |
| Other, n | 16 (1.52) | 15 (1.43) | 0.86 |
| Respiratory, n | 21 (2.00) | 14 (1.33) | 0.23 |
| Total outs, n (%) | 73 (6.95) | 53 (5.05) | 0.06 |
| Shipped, n | 977 | 997 | – |
1CON = control, standard finishing diet; CLO = CLOSTAT steers fed control diet supplemented with 0.5 g/hg/d Bacillus subtilis PB6(CLOSTAT 500, Kemin Industries, Des Moines, IA), administered through the micro-ingredient machine.
2“Other”, diagnosis includes lameness, rectal prolapse, hardware disease or heart failure, peritonitis, or enteritis.
3Describes cattle removed from pen for suspected respiratory disease but with rectal temperature ≤40 °C.