Prolactin Content of the Anterior Pituitary Gland of Turkey Hens in Diiferent Reproductive Stages

Cherms, F. L.; Herrick, R. B.; McShan, W. H.; Hymer, W. C.

doi:10.1210/endo-71-2-288

Cited by 34 publications

(6 citation statements)

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“…Measurements of prolactin in the pituitary gland have, however, provided equivocal evidence for the role of the hormone in incubation. Prolactin concentrations in the pituitary gland, as measured by the pigeon crop sac bioassay, are higher in incubating than in laying female domestic fowl (Saeki & Tanabe, 1955), ring-necked pheasants (Phasianus colchicas; Breitenbach & Meyer, 1959) and turkeys (Meleagris gallopavo; Cherms, Herrick, McShan & Hymer, 1962) but in the California quail (Lophortyx californicus) they are low during laying and early incubation and increase only during brooding (Jones, 1969). Buntin & Forsyth (1979), using a pigeon crop sac radioreceptor assay, found less prolactin in the pituitary glands of incubating than of laying pigeons (Columba livid) and interpreted this as evidence for an increased release of the hormone into the circulation during incubation.…”

Section: Introductionmentioning

confidence: 99%

Incubation in Mallards (Anas Platyrhynchos): Changes in Plasma Levels of Prolactin and Luteinizing Hormone

Goldsmith¹,

Williams²

1980

Journal of Endocrinology

100

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The concentrations of prolactin and LH were measured in the plasma of male and female mallards (Anas platyrhynchos) during the breeding season. The concentration of prolactin in the female birds was low before and during egg-laying, increased threefold (P less than 0.001) during incubation and returned to basal levels immediately after the young were hatched. The drakes, which do not participate in incubation in this species, had fairly low prolactin levels throughout the breeding period; levels being slightly higher during the incubation phase than at other times but still much lower (P less than 0.001) than in the incubating females. Concentrations of LH in the females were high during egg-laying but declined at the onset of incubation. In the drakes levels of LH remained high for much longer and did not appear to decline at a fixed time relative to the reproductive cycle of the female birds. These observations support the view that prolactin is associated with incubation in birds, though the data do not permit a conclusion as to whether an increase in prolactin secretion causes incubation behaviour or is stimulated by it.

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Section: Introductionmentioning

confidence: 99%

Incubation in Mallards (Anas Platyrhynchos): Changes in Plasma Levels of Prolactin and Luteinizing Hormone

Goldsmith¹,

Williams²

1980

Journal of Endocrinology

100

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“…Highly purified preparations have been isolated from mammalian pituitaries, and details of the amino acid sequence in the substance have been reported; however, no such data are available for the avian hormone. The pituitaries of broody chickens contain more prolactin than do those of nonbroody ones (Saeki and Tanabe, 1955); this has also been demonstrated in pigeons, and the gull (see , the pheasant (Breitenbach and Meyer, 1959), and turkeys (Cherms et al, 1962). Nakajo and Imai (1961) have shown that the prolactin content of the pituitary tends to be inversely proportional to the level of FSH and LH.…”

Section: Hormones Of the Anterior Lobementioning

confidence: 87%

Avian Physiology

1976

Springer Advanced Texts in Life Sciences

140

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“…At the transition from egg laying to broodiness, sharply increased time is spent nesting, and this has been associated with increased pituitary (Cherms et al, 1962;Burke and Papkoff, 1980) and serum prolactin concentrations Proudman and Opel, 1981) in commercial strains of turkeys. Few of the egg strain hens express all of the characteristics of the broody phase of reproduction.…”

Section: Discussionmentioning

confidence: 99%

“…In the turkey, pituitary prolactin levels are increased in hens classified as broody (Cherms et al, 1962;Burke and Papkoff, 1980). Plasma prolactin increases sharply and concurrently with nesting time at the onset of broodiness El Halawani et al, 1980;Proudman and Opel, 1981).…”

Section: Introductionmentioning

confidence: 99%

Influence of Genetic Increases in Egg Production on Traits Associated with Broodiness in Turkeys

et al. 1983

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Egg production, nesting frequency, and serum levels of prolactin, estradiol, and total phosphorus were monitored in relatively nonbroody (egg) and relatively broody (RBC1) strains of turkey hens during a reproductive period. In the egg strain, prolactin levels were increased in a group with a relatively high frequency of nesting in comparison to a group with a relatively low frequency of nesting. No differences between these two groups were detected for serum estradiol, total phosphorus, or egg production. In the RBC1 strain, prolactin levels did not differ between a group of hens that did not exhibit broodiness and a group that exhibited one or more bouts of broodiness. A broodiness treatment was used for the latter group. The broody group exhibited extremely variable levels of prolactin. In individual broody hens, the levels of prolactin were relatively high. After broodiness in 12 of 13 hens, the level of prolactin fell to relatively low levels. In the one hen not responding to broodiness treatment, the level of prolactin became low levels. In the one hen not responding to broodiness treatment, the level of prolactin became extremely high. Nesting frequency, total serum phosphorus, and egg production were generally not different between the two groups. The level of prolactin showed seasonal changes in both strains of hens, starting low, increasing to maximal levels between 40 and 80 days of production, and then declining to low levels late in the reproductive period. Laying hens always had higher levels of prolactin than nonlaying, nonbroody hens.

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Prolactin Content of the Anterior Pituitary Gland of Turkey Hens in Diiferent Reproductive Stages

Cited by 34 publications

References 0 publications

Incubation in Mallards (Anas Platyrhynchos): Changes in Plasma Levels of Prolactin and Luteinizing Hormone

Incubation in Mallards (Anas Platyrhynchos): Changes in Plasma Levels of Prolactin and Luteinizing Hormone

Avian Physiology

Influence of Genetic Increases in Egg Production on Traits Associated with Broodiness in Turkeys

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