Table 5.
Effect of metaphylaxis with a sterile saline (negative control), tulathromycin, ceftiofur, and florfenicol on finishing growth performance of high-risk, steers
| Treatment1 | ||||||
|---|---|---|---|---|---|---|
| Item | CON | DRA | EXC | NUF | SEM2 | P-value |
| N, steers | 55 | 61 | 60 | 62 | - | - |
| N, pens | 16 | 16 | 16 | 16 | - | - |
| Initial body weight3, kg | 294 | 306 | 299 | 288 | 7.03 | 0.33 |
| Final body weight3, kg | 581 | 602 | 607 | 587 | 14.9 | 0.22 |
| Overall finishing | ||||||
| ADG, kg | 1.41b | 1.46a,b | 1.52a | 1.48a,b | 0.030 | 0.05 |
| DMI, kg | 8.47 | 8.59 | 8.97 | 8.47 | 0.172 | 0.14 |
| DMI, % of BW | 1.94 | 1.89 | 1.99 | 1.94 | 0.031 | 0.23 |
| G:F | 0.167 | 0.171 | 0.170 | 0.175 | 0.0032 | 0.40 |
| Carcass-adjusted | ||||||
| Final BW4, kg | 586 | 606 | 606 | 590 | 13.6 | 0.20 |
| ADG, kg | 1.45b | 1.48a,b | 1.52a | 1.50a,b | 0.027 | 0.05 |
| DMI, % of BW | 1.93 | 1.88 | 1.98 | 1.93 | 0.028 | 0.24 |
| G:F | 0.171 | 0.172 | 0.169 | 0.175 | 0.031 | 0.40 |
a,b,cWithin a row, means with different superscripts differ P < 0.05.
1CON = no metaphylaxis at arrival; DRA = tulathromycin (Draxxin, Zoetis) administered as metaphylaxis at arrival; EXC = ceftiofur (Excede, Zoetis) administered as metaphylaxis at arrival; NUF = florfenicol (Nuflor, Merck) administered as metaphylaxis at arrival.
2Standard error of least squares mean (N = 6 pens per mean).
3All BW are shrunk by 4%.
4 Hot carcass weight divided by overall average DP (65.8%).