Table 4.
Growth measures over time in broiler chickens vaccinated in hatchery for coccidiosis fed a commercial additive (FA), no additive (CON), or a medicated feed (AGP) (bacitracin methylene disalicylate).
| CON | FA | AGP | SEM | P trt | P trt × d | |
|---|---|---|---|---|---|---|
| Body weight, kg | ||||||
| Day 7 | 153.2 | 155.6 | 154.3 | 0.9 | 0.85 | 0.02 |
| Day 14 | 408.1a | 417.5b | 415.7b | 1.9 | ||
| Day 20 | 700.8 | 689.5 | 694.9 | 4.7 | ||
| Day 28 | 1353.8 | 1347.4 | 1352.0 | 6.4 | ||
| Day 36 | 2030.0 | 2028.2 | 2010.9 | 15.3 | ||
| Average daily feed intake, g/d | ||||||
| Day 7 | 19.05 | 18.98 | 19.53 | 0.16 | 0.19 | 0.09 |
| Day 14 | 51.49 | 51.86 | 51.17 | 0.33 | ||
| Day 20 | 80.86 | 80.56 | 80.12 | 0.37 | ||
| Day 28 | 131.81 | 131.27 | 130.69 | 1.01 | ||
| Day 36 | 156.38 | 158.16 | 153.10 | 1.59 | ||
| Feed: gain1 | ||||||
| Day 7 | 1.78a | 1.74b | 1.78a | 0.01 | 0.86 | <0.01 |
| Day 14 | 1.90a | 1.87b | 1.86b | 0.01 | ||
| Day 20 | 2.09 a | 2.20 b | 2.14 a,b | 0.03 | ||
| Day 28 | 1.88 a | 1.85 a,b | 1.84 b | 0.01 | ||
| Day 36 | 1.95 | 1.96 | 1.98 | 0.02 | ||
1Feed to gain adjusted to a common body weight (raw F: G—[(BW–2.41 kg) × 0.24).