The pineal gland and the photosexual reflex in female ducks

Cuello, A. Claudio; Hisano, N.; Tramezzani, Juan H.

doi:10.1016/0016-6480(72)90093-7

Cited by 12 publications

(4 citation statements)

References 11 publications

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“…Quail blinded while immature exhibited reduced adult body weights that were thought to be the result of decreased feed intake (Sayler and Wolfson, 1968b). Pinealectomy of adult ducks did not alter body weight but blinding or a combination of PX and blinding reduced body weights in diurnal lighting (Cuello et al, 1972). Feed intake data were not reported.…”

Section: Discussionmentioning

confidence: 94%

Pineal Gland and Ocular Influences on Turkey Breeder Hens

Siopes

1987

Poultry Science

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Yearling Large White turkey breeder hens underwent pinealectomy (PX), bilateral ocular enucleation (EX), or both and were then photo-induced into reproductive activity. During the subsequent 20-week reproductive period, data were recorded for body weight, change in body weight, feed intake, egg weight, eggshell thickness, and percent settable eggs. A significant interaction between PX and EX treatments did not occur for any of the parameters of this study. Absolute body weight, feed intake, shell thickness, and percent settable eggs were not significantly affected by PX during the study, but PX significantly increased egg weights. Feed intake was significantly reduced by EX, but other parameters were not affected. Both PX and EX reduced body weight losses typically observed in breeder hens during an in-season egg laying cycle. It was concluded that the pineal gland and the eyes can influence body weight changes, egg size, or feed intake in breeder turkey hens during a reproductive cycle.

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Section: Discussionmentioning

confidence: 94%

Pineal Gland and Ocular Influences on Turkey Breeder Hens

Siopes

1987

Poultry Science

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“…However, support for this hypothesis in the scientific literature is sparse. Pinealectomy has no (or a transient) effect on photoinduced gonadal development in a variety of species including sparrows (Donham and Wilson, 1969;Menaker et al, 1970), quail (Sayler and Wolfson, 1968a;Arrington et al, 1969;Siopes and Wilson, 1974), chickens (Harrison, 1972;Cogburn and Harrison, 1977;Johnson and Van Tienhoven, 1984), and ducks (Cuello et al, 1972). In a few cases, such as the Indian Weaver bird and male ducks, however, substantial effects of pinealectomy have been noted (Cardinali et al, 1971;Saxena et al, 1979).…”

Section: Introductionmentioning

confidence: 93%

“…A few studies of avian reproduction have utilized both pinealectomized and blinded birds. An inhibitory influence of pinealectomy and blinding on photostimulated gonadal development has been noted in ducks (Cuello et al, 1972) and quail (Sayler and Wolf son, 1968b). Little or no effect on egg laying occurred over short periods (4 to 8 weeks) in chickens (Harrison, 1972), but in quail either blinding or blinding plus pinealectomy blocked short-day-induced cessation of egg laying or testicular regression (Siopes and Wilson, 1974).…”

Section: Introductionmentioning

confidence: 95%

Pineal Gland and Ocular Influences on Turkey Breeder Hens.

Siopes

Underwood

1987

Poultry Science

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The influence of the pineal gland and the eyes on reproductive performance of turkey hens was examined. Photosensitive, yearling Large White turkey breeder hens underwent pinealectomy (PX) or bilateral ocular enucleation (EX) or both while held on 8 hr of light per day (8L:16D) and were then photoinduced into a typical 20-week egg laying period by exposing the birds to 16 hr of light per day (16L:8D). Data were obtained for the time to first egg (sexual maturation), rate of egg laying, percent fertility, percent hatchability, weight of poults at hatching, and plasma melatonin levels. A significant interaction between PX and EX treatments occurred in the sexual maturation data only. Pinealectomy significantly delayed (P less than .05) the onset of egg laying (by 4.1 to 7.4 days) compared with the other treatment groups. No other significant differences in onset of lay occurred. Pinealectomy significantly depressed egg production during weeks 11 to 20 of lay and this resulted in fewer eggs per PX hen over the 20-week study (85.4 vs. 93.3 eggs in the PX and pineal intact groups, respectively). Enucleation did not significantly affect egg production. Neither the PX nor the EX treatment significantly affected fertility or hatchability determined at 4-week intervals over the 20-week study. However, poult weights were significantly greater as a result of either PX (P less than .01) or EX (P less than .05) treatment. Nocturnal elevation of plasma melatonin was significantly reduced by PX but not by EX. It was concluded that an extraretinal, extrapineal photoreceptive mechanism is operative in turkey breeder hens but both the pineal gland and the eyes can influence certain reproductive parameters.

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“…Pinealectomized white-crowned sparrow [Farnf.r and Follett, 1966] and quail [Homma et al, 1967;A rrington et al, 1969] exhibited quite normal gonadal responses to long or short photoperiods. However, pinealectomy suppressed the light-induced in crease of gonad development in ducks [Cardinali et al, 1971;Cuello eta/., 1972;Hisano et a!., 1972] and in quail [Kato et al, 1967;O ishi and Kato, 1968].…”

mentioning

confidence: 99%

Multiple-Unit Activity in the Pineal Gland of the Japanese Quail: Spontaneous Firing and Responses to Photic Stimulations

Herbuté

Baylé²

1974

Neuroendocrinology

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The present study was devoted to the recording ofspontaneous multiple-unit discharges in the pineal gland of the quail to investigate the influence of light stimulation on the multiunit pineal activity. The spontaneous rate of firing depended upon the size of the macro-microelectrodes (86 spikes/10 sec with 30 µm electrodes; 25 spikes/10 sec with 15 µm electrodes). Light flashes resulted in a marked inhibition of electrical discharges recorded from the same cell populations (54 vs 86 and 14 vs 25 spikes/10 sec). A bilateral section of optic nerves suppressed the inhibiting response of pineal activity to illumination and allowed the spontaneous firing rate to be increased almost 4-fold in blinded quail compared to intact controls.

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The pineal gland and the photosexual reflex in female ducks

Cited by 12 publications

References 11 publications

Pineal Gland and Ocular Influences on Turkey Breeder Hens

Pineal Gland and Ocular Influences on Turkey Breeder Hens

Pineal Gland and Ocular Influences on Turkey Breeder Hens.

Multiple-Unit Activity in the Pineal Gland of the Japanese Quail: Spontaneous Firing and Responses to Photic Stimulations

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