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Fig. 3. Variations in cut-off wavelength (
cut) of the different
pigmented cone oil droplets in the dorsal and ventral retina as a function of
the type and duration of light treatment. Solid line, `bright-light' group;
broken line, `dim-light' group. Bars around data points represent ±1
s.d. for the mean value (N=10). Panels A-D show data for C-, Y-, R-
and P-type oil droplets located in the dorsal retina and panels E-H show data
for the same droplet types located in the ventral retina. The earliest
microspectrophotometric data were obtained after 6 weeks of exposure to the
different lighting conditions, i.e. when the chickens were 10 weeks old.
Chickens reach sexual maturity between 18 and 24 weeks of age and the state of
maturity is indicated on each graph, with the border between juvenile and
adult status taken as the midpoint of this range (i.e. 21 weeks of age), which
occurred 17 weeks after the onset of the different light treatments.
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