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Table 3.

Serum levels of corticosterone and estradiol in rats exposed to increasing light intensities during darkness

Light intensity (μW/cm2)Nude rat serum corticosterone (ng/mL)Nude rat serum estradiol (pg/mL)Buffalo rat serum corticosterone (ng/mL)
Constant light, 345 196.2 ± 53.5 25.1 ± 11.3 53.25 ± 23.7 
0.08 265.0 ± 28.17 19.9 ± 10.1 120.83 ± 19.6 
0.06 322.7 ± 43.8 27.1 ± 16.8 105.08 ± 25.8 
0.05 289.3 ± 41.8 20.3 ± 10.78 155.5 ± 19.1 
0.02 266.8 ± 34.7 25.1 ± 5.9 138.75 ± 26.8 
Dark 266.1 ± 34.4 19.3 ± 10.7 111.08 ± 29.5 
Light intensity (μW/cm2)Nude rat serum corticosterone (ng/mL)Nude rat serum estradiol (pg/mL)Buffalo rat serum corticosterone (ng/mL)
Constant light, 345 196.2 ± 53.5 25.1 ± 11.3 53.25 ± 23.7 
0.08 265.0 ± 28.17 19.9 ± 10.1 120.83 ± 19.6 
0.06 322.7 ± 43.8 27.1 ± 16.8 105.08 ± 25.8 
0.05 289.3 ± 41.8 20.3 ± 10.78 155.5 ± 19.1 
0.02 266.8 ± 34.7 25.1 ± 5.9 138.75 ± 26.8 
Dark 266.1 ± 34.4 19.3 ± 10.7 111.08 ± 29.5 

NOTE: See Figs. 3 and 4 legends for further details. Blood samples were taken during the middle of the true dark or subjective dark phase. Mean serum hormone (±SE); n = 6 rats per group. There were no significant differences in hormone levels among any of the groups exposed to different light intensities.

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