The possible role of prolactin in laying performance and steroid hormone secretion in domestic hen (Gallus domesticus)

Reddy, I. J.; David, C. G.; Sarma, P. V.; Singh, Kiranjeet

doi:10.1016/s0016-6480(02)00034-5

Cited by 58 publications

(39 citation statements)

References 37 publications

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“…Moreover, expression of prolactin receptor mRNA is evidence that the chicken ovary is a target tissue for prolactin [54,63,64]. Finally, prolactin has been shown to have an inhibitory effect on gonadotropin-stimulated estradiol secretion in vitro by white follicles in laying and out-of-lay Gifujidori hens [61].…”

Section: Discussionmentioning

confidence: 99%

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: Discussionmentioning

confidence: 99%

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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“…Although statistics cannot be run to test for a difference in the decrease in PRL levels between bromocriptine and control groups as only one animal was kept in captivity and involved in each treatment, we are confident that the treatment decreased PRL levels, as bromocriptine administration is known to suppress PRL levels in birds (Reddy et al, 2002). Moreover, bromocriptine is particularly well known as a suppressant of PRL secretion in penguins.…”

Section: Discussionmentioning

confidence: 97%

“…Plasma PRL levels were experimentally decreased by treating the penguin with an intramuscular injection of bromocriptine (Parlodel R long-acting form, Sandoz, Basel, Switzerland; 1.5·mg·kg -1 ·body·mass). Bromocriptine is a dopamine agonist that inhibits PRL secretion in mammals (Bridges and Ronsheim, 1990;Roberts et al, 2001;Ben-Jonathan and Hnasko, 2001), and in birds Reddy et al, 2002). One group (bromocriptine group, N=23 birds) was treated with bromocriptine; the other (control group, N=24 birds) was treated with a vehicle (10% ethanol solution).…”

Section: Manipulation Of Prolactin Levels and Prolactin Assaymentioning

confidence: 99%

Kidnapping of chicks in emperor penguins: a hormonal by-product?

Angelier

Barbraud

Lormée

et al. 2006

Journal of Experimental Biology

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SUMMARY The function and causes of kidnapping juveniles are little understood because individuals sustain some breeding costs to rear an unrelated offspring. Here we focus on the proximal causes of this behaviour in emperor penguins (Aptenodytes forsteri), whose failed breeders often kidnap chicks. We experimentally tested the hypothesis that kidnapping behaviour was the result of high residual levels of prolactin (PRL), a hormone involved in parental behaviour. Penguins with artificially decreased PRL levels by bromocriptine administration kidnapped chicks less often than control penguins. Within the bromocriptine treated group, kidnapping behaviour was not totally suppressed and the probability of kidnapping a chick was positively correlated to PRL levels measured before treatment. During breeding, emperor penguins have to forage in remote ice-free areas. In these birds, PRL secretion is poorly influenced by chick stimuli and has probably evolved to maintain a willingness to return to the colony after a long absence at sea. Therefore, penguins that have lost their chick during a foraging trip still maintain high residual PRL levels and this, combined with colonial breeding,probably facilitates kidnapping. We suggest that kidnapping in non-cooperative systems may result from a hormonal byproduct of a reproductive adaptation to extreme conditions.

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“…Therefore, the increase in CL number is likely responsible for the increased progesterone concentrations in the GnRH group. Also, studies on sheep [33] (McNatty and Land, 1979), mouse [11], humans [32], porcine [63], chicken and domestic hen [52] and turkey [46] suggest that low concentration of prolactin is required for synthesis of progesterone, since high concentration of prolactin decreases progesterone levels by stimulating hydroxysteroid dehydrogenase enzyme, which brings about the catabolism of progesterone [52,64]. Similar observation in birds is not clear but prolactin inhibits granulose cell progesterone at high doses [56] but not at lower, physiological doses [17].…”

Section: Discussionmentioning

confidence: 99%

Patterns of folliculogenesis in ducks following the administration of a gonadotropin-releasing hormone 1 (GnRH) analogue

Zoheir

Ahmed

2012

Journal of Genetic Engineering and Biotechnology

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The efficacy of synthetic gonadotrophin-releasing hormone (GnRH) analogue in improving the folliculogenesis of ducks has not been established. The aim of the study was to investigate the effect of oral administration of GnRH analogue as luteinizing hormone releasing hormone A 2 (LHRH-A 2 ) on expression of relevant genes, egg production, changes of hormone levels and an ovarian follicle development in ducks. Five hundred ducks at 220 days old were randomly allotted to five groups, where each bird received daily in food 0, 5, 10, 15, or 20 lg LHRH-A 2 for 60 days. In all treated groups, a non-significant increase in the level of GnRH receptor was noticed as compared to the corresponding control. Interestingly, the egg product in the 10 and 15 lg LHRH-A 2 groups was profoundly increased (P < 0.05) if compared to 0 and 5 lg LHRH-A 2 groups or control. A reduction in circulating prolactin (PRL) levels occurs concurrently with an increase in progesterone (P 4 ) and estradiol (E 2 ) particularly in 5, 10 and 15 lg LHRH-A 2 groups. Maximal apoptotic percentage for the granulosa cells was obtained in 20 lg LHRH-A 2 group as compared to control or 5, 10 and 15 lg treatment groups. Finally, these data suggest that the oral administration of 10 and 15 lg LHRH-A 2 may induce ovarian cycle and play vital gonadotrope role during the folliculogenesis process in ducks. This study also demonstrated a need to concentrate further research on the potential effect of GnRH during the early period to improve the reproductive performance.

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The possible role of prolactin in laying performance and steroid hormone secretion in domestic hen (Gallus domesticus)

Cited by 58 publications

References 37 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

Kidnapping of chicks in emperor penguins: a hormonal by-product?

Patterns of folliculogenesis in ducks following the administration of a gonadotropin-releasing hormone 1 (GnRH) analogue

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