Figure 1
24-h changes in plasma prolactin levels of 11 days old male rabbit pups. Groups of 6–7 pups were killed by decapitation at 6 different time intervals throughout a 24 h cycle. Bar indicates scotophase duration. Results are the means ± SEM. a p < 0.01 vs. all time points. b p < 0.01 vs. 01:00 h, 05:00 h and 13:00 h, Tukey-Kramer's multiple comparisons test. For further statistical analysis, see text.
Figure 2
24-h changes in median eminence and adenohypophysial DA concentration in 11 days old male rabbit pups. Groups of 6–7 pups were killed by decapitation at 6 different time intervals throughout a 24 h cycle. Bar indicates scotophase duration. Results are the means ± SEM. Circulating prolactin levels are shown in shaded line. Letters indicate the existence of significant differences between time points within each tissue after a Tukey-Kramer's multiple comparisons test, as follows: a p < 0.01 vs. all time points. b p < 0.01 vs. 05:00 h, 09:00 h and 21:00 h. c p < 0.01 vs. 05:00 and 21:00 h. For further statistical analysis, see text.
Figure 3
24-h changes in median eminence and adenohypophysial 5HT concentration in 11 days old male rabbit pups. Groups of 6–7 pups were killed by decapitation at 6 different time intervals throughout a 24 h cycle. Bar indicates scotophase duration. Results are the means ± SEM. Circulating prolactin levels are shown in shaded line. Letters indicate the existence of significant differences between time points within each tissue after a Tukey-Kramer's multiple comparisons test, as follows: a p < 0.01 vs. all time points. b p < 0.01 vs. 01:00 h, 09:00 h, 17:00 and 21:00 h. For further statistical analysis, see text.
Figure 4
24-h changes in median eminence and adenohypophysial GABA concentration in 11 days old male rabbit pups. Groups of 6–7 pups were killed by decapitation at 6 different time intervals throughout a 24 h cycle. Bar indicates scotophase duration. Results are the means ± SEM. Circulating prolactin levels are shown in shaded line. Letters indicate the existence of significant differences between time points within each tissue after a Tukey-Kramer's multiple comparisons test, as follows: a p < 0.01 vs. all time points. b p < 0.01 vs. 01:00 h, 05:00 h and 09:00 h, p < 0.05 vs. 17:00 h. For further statistical analysis, see text.
Figure 5
24-h changes in median eminence and adenohypophysial taurine concentration in 11 days old male rabbit pups. Groups of 6–7 pups were killed by decapitation at 6 different time intervals throughout a 24 h cycle. Bar indicates scotophase duration. Results are the means ± SEM. Circulating prolactin levels are shown in shaded line. Letters indicate the existence of significant differences between time points within each tissue after a Tukey-Kramer's multiple comparisons test, as follows: a p < 0.01 vs. all time points. b p < 0.01 vs. 01:00 h, 09:00 h and 13:00 h. For further statistical analysis, see text.