A New Hypothesis for the Asynchronous Ovulatory Cycle of the Domestic Hen (Gallus domesticus)

Bastian, J. W.; Zarrow, M. X.

doi:10.3382/ps.0340776

Cited by 43 publications

(17 citation statements)

References 20 publications

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“…The weight of consecutive eggs within a sequence gradually decreases (Belyavin et al, 1987;Miyoshi et al, 1997). Similar patterns have been observed with yolk weights (Bastian and Zarrow, 1955;Zakaria et al, 1984;Zakaria, 1999) with the heaviest yolks occurring more frequently in the first two places of a sequence (Gilbert, 1972). Eggshell weight tends to be heaviest in the terminal egg of the clutch (Miyoshi et al, 1997), presumably because the lag in oviposition time is the longest for the last egg, which means a longer period of time is devoted to shell deposition.…”

Section: Introductionsupporting

confidence: 53%

Modelling the changes in the proportions of the egg components during a laying cycle

Johnston

Gous

2007

British Poultry Science

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1. As hens age, egg weight increases but the eggs contain proportionally more yolk and less albumen and shell. However, at a given age, larger eggs contain proportionally more albumen. When modelling the nutrient requirements of the hen over a production cycle, based on the daily outputs of each nutrient, egg weight needs to be predicted as the sum of the three components, since each has a unique chemical composition, and these proportional changes will therefore influence the nutrient requirements of the hen. 2. Yolk weight is related to hen age and may be calculated using a logistic or Gompertz function. Allometric functions are used to predict albumen weight from yolk weight and shell weight from the weight of the egg contents. 3. A mechanistic, stochastic population model for layers may be used to verify that these functions correctly reflect the proportional changes in the egg components with advancing hen age and at a given age, over a range of egg weights. 4. The various parameters used in the equations need to be defined for the available genotypes.

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Section: Introductionsupporting

confidence: 53%

Modelling the changes in the proportions of the egg components during a laying cycle

Johnston

Gous

2007

British Poultry Science

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“…This change in variability of OT within a hen may suggest that the mechanism controlling the initial ovipositions in a sequence is more sensitive to hormonal secretion than those of the following one. Bastian and Zarrow (1955) reported that in domestic hens the first follicle of the sequence is more sensitive to LH than the following follicles. The first follicle is the most mature and therefore the most easily ovulable and probably least controlled.…”

Section: Discussionmentioning

confidence: 97%

Characteristics of oviposition patterns of turkey hens and the influence of different wavelengths of light

Pyrzak

Siopes

1989

British Poultry Science

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1. Characteristics of individual oviposition patterns of turkey breeder hens were determined for 160 d of photostimulation with fluorescent blue, green or red light and with incandescent light. 2. In all treatments most eggs were laid during the afternoon and evening. The maximum frequency occurred at 14.00 to 15.00 h (8 to 9 h after light onset); about 15% of all eggs were laid in the dark period. 3. The hourly oviposition distribution remained unchanged and was specific to individual hens throughout the study period. However, it was highly variable between hens, ranging from highly dispersed to tightly clustered. 4. The total number of clutches per hen did not differ between treatments and eggs were laid in relatively short clutches; 65% were of two eggs or fewer, 30% of three to 5 eggs and only 5% of 6 eggs or more. 5. The oviposition time of the first egg in a clutch was very variable; however, oviposition time became more clustered and uniform as the position of the egg in a clutch increased. 6. Mean time of lay, mean interval between eggs and total lag time were not influenced by light treatment. Mean interval was about 27 h for all eggs and was not influenced by clutch size. 7. Light quality at the intensity used in this study did not appear to play an important role in oviposition patterns of turkey hens.

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“…Hypotheses attempting to explain the control of ovulation in the hen should include, therefore, considerations of the daily lag between ovulations and the ' missed ' ovulation which terminates the 'clutch' sequence. Several theories have been proposed to account for these events in terms of a neuroendocrine control mechanism (Fraps, 1954(Fraps, , 1955Bastian & Zarrow, 1955;Nalbandov, 1959Nalbandov, , 1961 but probably the most attractive and extensive was that of Fraps (1961). To explain the fact that the release of luteiniz¬ ing hormone (LH) and ovulation are restricted to some 8 h in hens kept under a normal lighting régime, he postulated a diurnal variation in the threshold of a neural component, concerned with the release of LH, which he considered was sensitive to an 'excitation' hormone secreted by the developing follicle.…”

Section: Introductionmentioning

confidence: 99%

Luteinizing Hormone and Progesterone in Peripheral Blood During the Ovulatory Cycle of the Hen Gallus Domesticus

Furr¹,

Bonney²,

England³

et al. 1973

Journal of Endocrinology

170

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Radioimmunoassays were used to estimate luteinizing hormone (LH) and progesterone in samples of blood taken from individual hens at frequent intervals throughout their respective ovulatory cycles. A consistent pattern in the plasma levels of both hormones was observed. Significantly more LH and progesterone was present in plasma 4\p=n-\7h before ovulation than at other times during the cycle. An increase in the level of progesterone either preceded that of LH or the two hormones increased simultaneously. At no time did an increase in the level of LH occur before the rise in progesterone.In those birds which did not ovulate during the experimental period the levels of both hormones remained low. The significance of these findings in relation to the neuroendocrine control of ovulation in the hen is discussed.

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A New Hypothesis for the Asynchronous Ovulatory Cycle of the Domestic Hen (Gallus domesticus)

Cited by 43 publications

References 20 publications

Modelling the changes in the proportions of the egg components during a laying cycle

Modelling the changes in the proportions of the egg components during a laying cycle

Characteristics of oviposition patterns of turkey hens and the influence of different wavelengths of light

Luteinizing Hormone and Progesterone in Peripheral Blood During the Ovulatory Cycle of the Hen Gallus Domesticus

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