Table 4. Effect of dietary Fe concentration and source on growth performance in weanling pigs
| Item | Inorganic (ppm) | HME (ppm) | Organic (ppm) | SEM | p-value |
| 100 | 50 | 75 | 100 | 100 |
| Phase I (0-14 d) |
| ADG (g) | 281 | 277 | 283 | 282 | 279 | 6.13 | 0.999 |
| ADFI (g) | 394 | 395 | 389 | 411 | 413 | 6.33 | 0.723 |
| FCR | 1.40 | 1.45 | 1.37 | 1.46 | 1.49 | 0.03 | 0.684 |
| Phase II (15-28 d) |
| ADG (g) | 420 | 406 | 419 | 431 | 433 | 6.17 | 0.708 |
| ADFI (g) | 704 | 680 | 692 | 724 | 722 | 6.03 | 0.068 |
| FCR | 1.68 | 1.68 | 1.66 | 1.69 | 1.68 | 0.03 | 0.999 |
| Overall (0-28 d) |
| ADG (g) | 350 | 342 | 351 | 356 | 356 | 4.88 | 0.901 |
| ADFI (g) | 549 | 537 | 541 | 567 | 568 | 4.75 | 0.098 |
| FCR | 1.57 | 1.58 | 1.54 | 1.59 | 1.60 | 0.02 | 0.893 |
HME, hot melt extrusion; SEM, standard error of means; ADG, average daily gain; ADFI, average daily feed intake; FCR, feed conversion ratio.