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Journal of Biological Rhythms
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Photoperiodic Induction in Quail as a Function of the Period of the Light-Dark Cycle: Implications for Models of Time Measurement

Brian K. Follett

AFRC Research Group on Photoperiodism & Reproduction, Department of Zoology, University of Bristol, Bristol BS8 1UG, United Kingdom

Alison S. Pearce-Kelly

AFRC Research Group on Photoperiodism & Reproduction, Department of Zoology, University of Bristol, Bristol BS8 1UG, United Kingdom

The earliest detectable event in the photoperiodic response of quail is a rise in luteinizing hormone (LH) secretion beginning at about hour 20 on the first long day. The timing of this rise was measured in castrated quail after entrainment to short daylengths which cause significant phase angle differences in the circadian system: (1) LD 2:22 and LD 10:14, and (2) LD 3:21 (T = 24 hr) and LD 3:24 (T = 27 hr). The quail were then exposed to 24 hr of light (by delaying lights-off ), and the time of the first LH rise was measured; it was similar in all schedules. Quail were also entrained to LD 3:21 or LD 3:24 and then given a single 6-hr nightbreak 6-12, 7-13, or 13-19 hr after dawn. The earlier pulse was marginally more inductive in the 27-hr cycle. Thus the entrainment characteristics of the photoinducible rhythm ({Phi}1) in quail appear very different from those of the locomotor circadian rhythm, and raise doubts as to whether {Phi}1 is a primary circadian oscillator.

Key Words: photoperiodism • daylength • LH • quail

Journal of Biological Rhythms, Vol. 6, No. 4, 331-341 (1991)
DOI: 10.1177/074873049100600404
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