Daily rhythm of plasma insulin in Japanese quail (Coturnix c. japonica) fed Ad libitum
1. 1. Plasma levels of immuno-reactive insulin (IRI) of 6 groups of 5-week-old quail, held on a 16L:8D photoregime, were measured every 4hr, for 24 hr. 2. 2. Concentrations of plasma IRI varied during the 24 hr period (Anova, P less than 0.003). Insulin levels were high (mean = 857 pg/ml) from 6 a.m. (light onset) until 6 p.m. (4 hr before light offset) and low (mean = 185 pg/ml) at 10p.m. and 2a.m. 3. 3. IRI concentrations at 6a.m., 10a.m., 2 p.m. and 6p.m. were significantly different from values at 2a.m. and 10p.m. by Waller grouping. 4. 4. Low IRI levels at light offset (10 p.m.-when the birds had full crops and were in an absorptive state) and high levels at light onset (6 a.m.-before feeding resumed) indicate that feeding does not fully account for the IRI rhythm. © 1992.
Comparative Biochemistry and Physiology -- Part A: Physiology
Tedford, B. L., and Meier, A. H. (1993). Daily rhythm of plasma insulin in Japanese quail (Coturnix c. japonica) fed ad libitum. Comparative Biochemistry and Physiology. Comparative Physiology,104(1):143-5. doi: 10.1016/0300-9629(93)90021-u.