Table 3.

Behavioural Analysis Before, During and After Noise Stress.

	Before stress (10 min)			During stress (10 min)			After stress (10 min)
	Vehicle	40% corticosterone	100% corticosterone	Vehicle	40% corticosterone	100% corticosterone	Vehicle	40% corticosterone	100% corticosterone
Sitting (% time)	90.6 ± 4.1	91.6 ± 2.2	97.7 ± 1.8	41.9 ± 8.3	71.4 ± 8*	43.3 ± 6.3	58.3 ± 7.0	77.7 ± 9.7	83.8 ± 5.6
Total activity (% time)	9.4 ± 4.1	8.4 ± 2.2	2.3 ± 1.8	58.1 ± 8.3	28.6 ± 9*	56.7 ± 6.3	41.7 ± 7.0	22.2 ± 9.7	16.2 ± 5.6
Locomotion (% time)	1.0 ± 0.5	1.1 ± 0.5	0.4 ± 0.3	10.9 ± 2.4	3.8 ± 1.2*	7.1 ± 1.5	2.3 ± 0.7	0.7 ± 0.5	0.9 ± 0.4
Risk assessment (% time)	0.5 ± 0.3	0.4 ± 0.3	0.4 ± 0.4	27.9 ± 7.4	12 ± 3.1*	42 ± 6.0*	7.3 ± 3.4	10.0 ± 5.7	6.3 ± 2.9
Face washing (% time)	1.7 ± 1.1	1.9 ± 0.7	0.2 ± 0.2	17 ± 2.6	3.2 ± 1.7**	6.6 ± 1.6*	17.6 ± 4.1	4.8 ± 1.8**	4.0 ± 1.9**
Body grooming (% time)	6.2 ± 3.0	3.8 ± 1.1	1.3 ± 1.0	6.0 ± 2.2	0.7 ± 0.7*	1.0 ± 0.4*	8.2 ± 2.0	5.2 ± 3.0	2.1 ± 1.3
Rearing (events)	0 ± 0	0 ± 0	0.6 ± 0.6	7.5 ± 2.1	3.7 ± 1.8	10.3 ± 2.4	0.5 ± 0.3	0.4 ± 0.3	0.3 ± 0.3
Digging (events)	0.3 ± 0.3	1.3 ± 1.0	0 ± 0	0.2 ± 0.2	2.0 ± 1.0	7.5 ± 2.1	4.5 ± 2.5	1.6 ± 1.4	1.1 ± 0.9

One-way anova and Tukey’s post-hoc test (*P < 0.05; **P < 0.01 compared to vehicle) indicate differences in stress responsiveness in both the 40% and 100% corticosterone animals compared to vehicle animals. Data represent the mean ± SEM of behavioural parameters scored per 10 min bins before during and after the stressor of vehicle (n = 4), 40% (n = 6) or 100% corticosterone pellets (n = 6).