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Fig. 1. Effects of prior exposure to restricted feeding regimes on subsequent
photoperiodic induction of seasonal responses in photosensitive male
Red-headed Bunting (Emberiza bruniceps). Birds (N=6–8)
were first exposed for eight weeks to dim 12 h light: 12 h darkness (12L:12D;
L=
5 lux, D=0 lux) with restricted feeding (RF) regimes [6 h food present:
18 h food absent, P:A 6:18 (group 1, open circle) or P:A 12:12 (group 2,
closed circle)] and then subsequently subjected for another 13 weeks to a
highly stimulatory photoperiod (16L:8D; L=400 lux; D=0 lux) with food ad
libitum (free food, FF). The vertical dashed line indicates the boundary
between the 12L:12D and 16L:8D exposures. The response was recorded as changes
in fat deposition and body mass, testis growth, body molt (or regeneration of
feathers) and wing primary molt at intervals of 1–4 weeks during the
21-week experiment. In all figures, means (±s.e.m.) of the collected
data are presented. Clearly, the exposure to restricted feeding regimes had an
effect on subsequent induction of reproductive functions (e.g. testis growth
and development).
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