|  | Distribution of sexes | Weight at beginning of the experiment (kg) | Average weight gain per group per day (kg/day) | Average weight gain during 18 days per group (%) |
---|---|---|---|---|---|
control group | piglet 1 | female | 6.5 | 0.326 ± 0.08 | 102 ± 17.3 |
 | piglet 2 | female | 5.5 |  |  |
 | piglet 3 | female | 5.5 |  |  |
 | piglet 4 | male | 5.0 |  |  |
 | piglet 5 | male | 6.0 |  |  |
15 ppb group | piglet 6 | female | 4.5 | 0.322 ± 0.08 | 104 ± 14.2 |
 | piglet 7 | male | 7.0 |  |  |
 | piglet 8 | female | 5.0 |  |  |
 | piglet 9 | male | 4.5 |  |  |
 | piglet 10 | male | 7.0 |  |  |
83 ppb group | piglet 11 | female | 5.5 | 0.239 ± 0.04 | 70.9 ± 11.3* |
 | piglet 12 | male | 7.5 |  |  |
 | piglet 13 | female | 6.0 |  |  |
 | piglet 14 | male | 6.5 |  |  |
 | piglet 15 | male | 5.0 |  |  |