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- W2000751435 abstract "Photostimulation of quail by long daylengths stimulates LH and FSH release, the earliest increases in these hormones being detectable after 1 long day. Reproductive maturity is complete within 1 month. Steroid feedback becomes important during the second week of photostimulation and restricts LH and FSH secretion to a fraction of the concentrations observed in gonadectomized birds. The photoperiodic response is not all-or-none, and above a certain “critical daylength” the rate of gonadal growth, primarily controlled by the levels of FSH and testosterone, is proportional to daylength. Photoperiodic responses are qualitatively identical in gonadectomized and intact quail, arguing that stimulatory daylengths act directly on the hypothalamo-pituitary axis to alter LH and FSH secretion, and do not act by altering steroid feedback sensitivity and thereby gonadotrophin release. Any changes in feedback sensitivity are a consequence not a cause of the photoperiodic drive on the system. The use of “skeleton” photoperiods to mimic complete photoperiods is discussed. Whether or not one or two peaks of photoperiodic induction appear in asymmetric skeleton experiments depends both upon the duration of the first light period and of the night break itself. The rate of induction is less when quail are photostimulated with night breaks than with “complete” daylengths. The temporal position of the circadian rhythm(s) involved in photoperiodic time measurement in quail is controlled by both “dawn” and “dusk,” and so the position of the rhythm is phase-delayed as the days lengthen, occurring later and later in the night. This arrangement might have some bearing on the seasonal shift in critical daylength that occurs in quail exposed to natural photoperiods. The situation is compared with that in insects and plants." @default.
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- W2000751435 date "1981-11-01" @default.
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- W2000751435 title "The stimulation of luteinizing hormone and follicle-stimulating hormone secretion in quail with complete and skeleton photoperiods" @default.
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- W2000751435 doi "https://doi.org/10.1016/0016-6480(81)90071-x" @default.
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