Figure 1
Daily rhythms of serum and salivary urea concentrations in sheep. Both urea profiles showed clear diurnal rhythms: urea levels were high during the light phase and low during the dark phase of the natural light-dark cycle. Each point represents mean ± SEM. Gray bars indicate the dark phase of the natural light-dark cycle. Arrowheads indicate times of feeding. Asterisks indicate peaks of urea concentrations.
Table 1
Mesor (M), fiducial limits (F.L.) at 95%, Amplitude (A) and Acrophase (Φ), expressed in hours, with confidence interval (C.I.) at 95%, of serum and salivary urea during the two days of study
| Serum urea | |||||
| MESOR | F.L. 95% | A | Φ | C. I. 95% | |
| Day 1 | 5.12 | (4.56–5.67) | 1.56 | 12:24 | (08:16–16:32) |
| Day 2 | 5.21 | (4.66–5.76) | 1.48 | 11:56 | (07:36–16:16) |
| Salivary urea | |||||
| Day 1 | 2.84 | (2.59–3.09) | 1.16 | 12:00 | (09:44–14:16) |
| Day 2 | 2.75 | (2.49–3.01) | 0.72 | 12:12 | (08:04–16:20) |