Hormonal Induction of Incubation Behavior in Ovariectomized Female Turkeys (Meleagris Gallopavo)1

Halawani, Mohamed E. El; Silsby, J.L.; Behnke, E.J.; Fehrer, S.C.

doi:10.1095/biolreprod35.1.59

Cited by 123 publications

(42 citation statements)

References 28 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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“…However, more recent studies using high doses of heterologous hormones ( O PRL) brought controversial results (Opel and Proudman, 1980;El Halawani et al, 1986;Sharp et al, 1988;Youngren et al, 1991 Otherwise, a pharmacologically induced decrease in prolactin levels affects the expression of incubation behaviour (El Halawani et al, 1983;Gu6men6 and Etches, 1989;Sharp et al, 1989) whereas the readiness to incubate after nest-deprivation does not appear to depend on high plasma prolactin concentrations (El Halawani et al, 1980;Goldsmith et al, 1984;. On the other hand, ovine prolactin has been reported to induce ovarian regression (Opel, 1971;Opel and Proudman, 1980) and to inhibit LH-stimulated steroidogenesis (Camper and Burke, 1977;Zadworny et al, 1989).…”

mentioning

confidence: 99%

Relationships between broodiness expression laying persistency and concentrations of hormones during the first productive period in turkey hens (Meleagris gallopavo)

Guemene

Williams²

1994

Reprod. Nutr. Dev.

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Summary ― The changes in egg production, in broodiness index and in plasma concentrations of LH, prolactin, cestradiol and progesterone were monitored throughout the first period of laying in turkey hens. The hens were subsequently classified according to their ability to express broodiness (33%) and their laying persistency; 25% were out-of-lay by the end of the experiment. A high percentage (67%) of the hens that went out-of-lay had previously been identified as broody. Altogether, a significant (p < < 0.05) physiological stage effect was found when comparing prolactin, cestradiol and progesterone data obtained from short and long laying persistency hens and this stage effect was also significant for oestradiol and progesterone data obtained from broody and non-broody hens. Otherwise, plasma LH concentrations decreased slightly but significantly throughout the laying year in all hens but no significant differences between physiological states were observed, although the decrease was more pronounced in the hens that went out-of-lay. Plasma progesterone concentrations remained stable throughout in laying hens but decreased significantly in broody and/or out-of-lay hens. Plasma prolactin concentrations were maximal between the 5th and 12th week of egg production and the levels observed in laying hens that did not become broody or had a long laying persistency were twice those measured in broody and/or out-of-lay hens. In the meantime, plasma oestradiol concentrations were lower and stable in laying hens, whereas they were higher during the first half of the productive period in broody and short laying persistency hens. These results suggest that, under our experimental conditions, the hormonal profiles of prolactin and cestradiol for a given hen during the first 10 weeks of the laying cycle may provide predictive information for future changes in its physiological status. The inverse relationship that was observed here between high early plasma concentrations of cestradiol and laying persistency is original. In addition, the relationship between the ability to express broodiness and high and low early plasma concentrations of cestradiol and prolactin, respectively, in hens submitted to preventive broody treatment has not been reported previously. Furthermore

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“…Furthermore, in several experiments, no or very few additional effects of the concurrent administration of progesterone could be detected in estrogen-treated females (quail: Noble, 1972). Inhibitory effects of progesterone on E2-induced female receptivity have even been reported in turkey hens (El Halawani et al, 1986). Similarly, in canaries, injections of progesterone inhibit the copulation-solicitation displays expressed by females in response to the playback of male song (Leboucher et al, 2000).…”

Section: Activation Of Receptivity and Proceptivitymentioning

confidence: 99%

“…It was demonstrated early on that implanting progesterone directly into diencephalic brain sites promotes the onset of incubation (Komisaruk, 1967). In female turkeys, it is clear that E2 and progesterone acting in synergy with prolactin are essential for the onset of incubation (El Halawani et al, 1986), whereas in doves this hormone seems to be important for the maintenance but not the onset of incubation (Buntin, 1986;Lea, 1987). Males have been studied less intensively, but results for ring doves suggest that males are affected more by situational and stimulus factors than by endocrine physiology compared to the female (Silver, 1978;Balthazart, 1983).…”

Section: Experimental Studies Of the Role Played By Steroid Hormones mentioning

confidence: 99%

Neuroendocrine Regulation of Reproductive Behavior in Birds

Ball

Balthazart

2009

Hormones, Brain and Behavior

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Hormonal Induction of Incubation Behavior in Ovariectomized Female Turkeys (Meleagris Gallopavo)1

Cited by 123 publications

References 28 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

Relationships between broodiness expression laying persistency and concentrations of hormones during the first productive period in turkey hens (Meleagris gallopavo)

Neuroendocrine Regulation of Reproductive Behavior in Birds

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