Intracranial Prolactin Perfusion Induces Incubation Behavior in Turkey Hens1

Youngren, Orlan M.; Halawani, M. E. El; Silsby, J.L.; Phillips, Richard E.

doi:10.1095/biolreprod44.3.425

Cited by 105 publications

(47 citation statements)

References 8 publications

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“…Recently, Huang et al [47] reported a negative correlation between inhibin and LH during the reproductive cycle in Magang geese. It is well known that prolactin plays the most important role in the timing and duration of incubation behaviour in broody birds [48][49][50][51]. In the present study, prolactin secretion markedly changed during the reproductive cycles of the turkey hens.…”

Section: Discussionsupporting

confidence: 44%

Comparative Changes in the Serum Concentrations of Inhibin-B, Prolactin, Gonadotropins and Steroid Hormones at Different Reproductive States in Domestic Turkey Hens

Khalil

Hanafy

Saleh

et al. 2009

Journal of Reproduction and Development

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Abstract. The present study was undertaken to compare the changes in circulating levels of inhibin-B, prolactin, follicle-stimulating hormone (FSH), luteinizing hormone (LH), estradiol-17β, progesterone and testosterone during the different reproductive states of turkey hens. Blood samples were collected during different reproductive states, at laying, incubating and out of lay. Inhibin-B was measured by ELISA, while other hormones were determined by Chemiluminescent Microparticle Immunoassay (CMIA). The results revealed highly significant differences among the hen's states for all serum hormone concentrations. The highest levels of inhibin-B and prolactin were observed in incubating hens, while the lowest values were observed in laying hens. In contrast, the highest levels of FSH, LH, estradiol-17β, progesterone and testosterone were found in the laying group, while the lowest values were found in the incubating group. The progesterone level was higher in the laying group compared with the other groups. These results clearly demonstrate that negative correlation was found between both the inhibin-B and prolactin levels and the gonadotropin and steroid hormone concentrations during the different reproductive states of the turkey hens. In addition, the results suggest that inhibin-B may be involved in control of FSH and LH secretion. . The existence of bioactive inhibin in testis preparations [3,4] and ovarian granulosa cells [5,6] has been reported. The effect of induction of ovarian regression and removal of ovarian follicles on plasma inhibin indicate that the ovary is the major source of inhibin in the hen [7,8]. Prolactin secretion from the avian anterior pituitary gland is principally maintained by tonic stimulation from hypothalamic prolactinreleasing factors [9]. Prolactin secretion markedly changes during the reproductive cycle of the turkey hen. The hyperprolactinemia associated with incubation behavior (broodiness) induces ovarian regression, resulting in a substantial loss of egg production in commercial breeder flocks [10]. Administration of exogenous prolactin suppresses plasma gonadotropins necessary for egg production in domestic fowl [11]. However, there is additional evidence that suppression of gonadotropin secretion in incubating birds also involves a mechanism independent of increased prolactin secretion [12,13]. In turkey hens, the changes in the concentrations of inhibin-B, prolactin, gonadotropins and progesterone have been poorly documented. Therefore, in the present study, we investigated the changes in inhibin-B, prolactin, FSH, luteinizing hormone (LH), estradiol-17β, progesterone and testosterone hormones during the different reproductive states. Materials and Methods Animals and experimental designDomestic turkey hens (local Egyptian strain) were used in the present study. The turkeys were in the first year of production. The hens received a stimulatory photoperiod of 14 h of light:10 h of dark throughout the experimental period and were maintained in floor pens with trap nests. They...

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Section: Discussionsupporting

confidence: 44%

Comparative Changes in the Serum Concentrations of Inhibin-B, Prolactin, Gonadotropins and Steroid Hormones at Different Reproductive States in Domestic Turkey Hens

Khalil

Hanafy

Saleh

et al. 2009

Journal of Reproduction and Development

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show abstract

“…A role for prolactin in avian parental behaviour was first reported as early as 1935 when injections of prolactin into domestic fowls were found to induce broodiness and egg incubation behaviours [21]. Increased parental behaviours have been shown after exogenous prolactin administration in willow ptarmigan, Lagopus l. lagopus [22], and in turkeys, Meleagris gallopavo [23].…”

Section: Infant Care and Prolactin Secretion In Cooperatively Breedinmentioning

confidence: 99%

Hormones Associated with Non-Maternal Infant Care: A Review of Mammalian and Avian Studies

Ziegler¹

2000

IJFP

127

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Hormonal changes during non-maternal infant care have been demonstrated in many cooperatively breeding bird species, some monogamous rodents and two species of New World primates. Coevolution of hormones and social traits may have provided for the different breeding systems that occur today. Several hormones have been shown to covary with the breeding systems of vertebrates. Elevated levels of the hormone prolactin with male parenting behaviours are common to many birds, rodents and the callitrichid monkeys Callithrix jacchus and Saguinus oedipus. In birds, prolactin may be elevated in both male and female breeders during various stages of nest building, egg laying, incubating and feeding of young. Testosterone levels appear to have an inverse relationship to prolactin levels during infant care in birds and rodents, but this relationship has not been examined for primates. In cooperatively breeding birds, helpers who remain at the nest also have elevated levels of prolactin when displaying parental care behaviours. Prolactin levels are elevated in helper callitrichid monkeys during the postpartum period. Monogamous male rodents demonstrate elevated prolactin levels with parental care behaviour but, in contrast to the birds, the mechanisms mediating prolactin increase appear to differ for male and female rodents. Two factors may influence male parental behaviours and hormonal changes: stimuli from the pregnant female and stimuli from the newborn pups; whereas maternal behaviours are influenced by the maternal hormones of the female and the pup stimuli. An experiential factor may also influence male parental behaviours. Neuropeptides such as oxytocin and vasopressin appear to be involved in male rodent parental care and there may be an interaction between a series of hormones and neurosecretions and stimuli from mates and pups. Studies of Saguinus oedipus, the cotton-top tamarin, suggest that prolactin levels are responsive to stimuli from contact with infants and the level of infant care experience influences the levels of prolactin with male infant care. Father tamarins also have elevated levels of prolactin before the birth of infants suggesting that cues from the pregnant female are important. Prolactin’s role in parental care may have evolved from prolactin’s role in other reproductive functions. Hormonal regulation of non-maternal care may occur due to a complex interaction of many hormones and neurotransmitters. Studies described here should provide the impetus for further work on parental care hormones in a wide variety of primates.

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“…On October 9, 1998, we changed the photoperiod to 10L 14D and stepped it by 2-h intervals each week to 14L 10D. On egg-day 2, we subcutaneously implanted in the scapular region of each female (without anesthesia) an osmotic pump (model 1002: Alza Corporation, Palo Alto, CA) containing ovine (as opposed to avian) prolactin (NIDDK oPRL-21) because previous studies have shown the readily available ovine prolactin (oprolactin) to be effective in birds (Pedersen, 1989;Youngren, El Halawani, Silsby, and Phillips, 1991) and to bind specifically to crude membrane fractions of ring dove, Streptopelia risoria, brain homogenates (Buntin and Ruzycki, 1987). Each pump contained 100 l of one of three o-prolactin concentrations and pumped at a rate of 0.28 l/h.…”

Section: Laboratory Studiesmentioning

confidence: 99%

The Role of Prolactin in the Regulation of Clutch Size and Onset of Incubation Behavior in the American Kestrel

Sockman

Schwabl

Sharp

2000

Hormones and Behavior

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Intracranial Prolactin Perfusion Induces Incubation Behavior in Turkey Hens1

Cited by 105 publications

References 8 publications

Comparative Changes in the Serum Concentrations of Inhibin-B, Prolactin, Gonadotropins and Steroid Hormones at Different Reproductive States in Domestic Turkey Hens

Comparative Changes in the Serum Concentrations of Inhibin-B, Prolactin, Gonadotropins and Steroid Hormones at Different Reproductive States in Domestic Turkey Hens

Hormones Associated with Non-Maternal Infant Care: A Review of Mammalian and Avian Studies

The Role of Prolactin in the Regulation of Clutch Size and Onset of Incubation Behavior in the American Kestrel

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