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Daytime (10:00–15:00) and nighttime (22:00–03:00) plasma melatonin concentrations (least square means ± s.e.m.) in gilts from different litters.
| Litter 1 (n = 4) | Litter 2 (n = 2) | Litter 3 (n = 4) | Litter 4 (n = 3) | Litter 5 (n = 2) | |
| Melatonin (pg/ml) | |||||
| Day | 2.6a ± 2.7 | 1.9a ± 3.8 | 0.6a ± 2.7 | 0.9a ± 3.1 | 2.5a ± 3.8 |
| Night | 23.2a ± 2.7 | 8.7b ± 3.8 | 6.4b ± 2.7 | 10.3b ± 0.9 | 15.0ab ± 3.8 |
a,bValues within a row with no superscript in common differ significantly (p < 0.05)
