Effect of ovine LH on the progesterone content of the granulosa cells in preovulatory follicles of the domestic fowl (Gallus domesticus)

Culbert, J.; Hardie, Marion A.; Wells, John W.; Gilbert, A. B.

doi:10.1530/jrf.0.0580449

Cited by 27 publications

(12 citation statements)

References 13 publications

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“…The increase in activity of granulosa enzymes during the rapid growth phase of the follicle can be interpreted as a mechanism whereby the tissue is prepared for a rapid burst in metabolic activity before ovulation. The observations are therefore in agreement with current ideas on the role of the tissue in the production of the preovulatory peak of progesterone (Culbert, Hardie, Wells & Gilbert, 1980;. The total activity of thecal 3ß-hydroxy-A5-steroid dehydrogenase reached a maximum in the F3 and F4 follicles and thereafter decreased as the follicle approached ovulation.…”

Section: Discussionsupporting

confidence: 91%

3β-Hydroxy-Δ5-steroid dehydrogenase activity in the rapidly growing ovarian follicles of the domestic fowl (Gallus domesticus)

Armstrong¹

1982

Journal of Endocrinology

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The total and specific activity of 3 beta-hydroxy-delta 5-steroid dehydrogenase, isocitrate dehydrogenase (NADP+) and glucose-6-phosphate dehydrogenase were measured in ovarian follicles from the domestic fowl. The enzymes were assayed in the five largest yolk-filled follicles which were sampled twice during the ovulatory cycle, at 1 h and 16 h before an expected ovulation. The total and specific activity of granulosa enzymes increased throughout the hierarchy and reached a maximum in the largest follicle. The relative increase in 3 beta-hydroxy-delta 5-steroid dehydrogenase activity was greater than that of the other two enzymes examined. The total thecal 3 beta-hydroxy-delta 5-steroid dehydrogenase activity reached a maximum in the third and fourth largest follicles. Thereafter its activity decreased up to the time of ovulation. The activity of 3 beta-hydroxy-delta 5-steroid dehydrogenase and glucose-6-phosphate dehydrogenase in follicles collected 1 h before and ovulation were significantly less than the activity in corresponding follicles collected 16 h before an ovulation.

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Section: Discussionsupporting

confidence: 91%

3β-Hydroxy-Δ5-steroid dehydrogenase activity in the rapidly growing ovarian follicles of the domestic fowl (Gallus domesticus)

Armstrong¹

1982

Journal of Endocrinology

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“…As the largest ovarian follicles are the main source of plasma progesterone in birds (Imai and Nalbandov, 1978;Culbert et al, 1980;Etches and Duke, 1984), this observation supports the conclusion that the hens which had low concentrations of progesterone were out of lay. Therefore, the treatment did not have the desired effect on egg production at this stage of the reproductive cycle, for these hens.…”

Section: Discussionsupporting

confidence: 79%

Changes in the plasma concentrations of prolactin, luteinising hormone, progesterone andd‐(β)‐hydroxybutyrate in turkey hens (meleagris gallopavo), during treatment of broodiness under commercial conditions

Guemene¹,

Etches

1990

British Poultry Science

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1. An experiment was done under commercial conditions to investigate the physiological effects of isolating broody turkey hens, for 72 h, in sand and wire floored pens on the third, 10th and 16th weeks of production. 2. Hens identified as broody and removed from the flock had higher plasma prolactin concentrations than the laying hens at each of the three experimental stages. 3. Confinement in sand and wire floored pens, induced a decline in plasma prolactin concentrations. This decline probably impeded immediate development of broody behaviour. Alternately, levels of prolactin higher than those of laying hens were again measured 7 and 14 days after treatment during third week but not after the 10th and 16th week of production. 4. Confinement did not induce consistent changes in luteinising hormone (LH) and progesterone concentrations from one period to an other. 5. An increase in the plasma concentration of D-(beta)-hydroxybutyrate was observed in the hens which had an egg present in the oviduct on day 2, 3 and/or 4 of the treatment. Subsequently, a decrease in ovulation rate was observed in the hens with higher concentrations of D-(beta)-hydroxybutyrate while under treatment, during the 10th week of production. 6. These data confirm that the effectiveness of the traditional methods for broodiness prevention under commercial conditions is related to the induction of a decrease of prolactin.

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“…Progesterone secretion does not increase until the ovary is fully developed (Williams and Sharp, 1977) as the chief site of synthesis is the granulosa cell layer of the largest follicle of the hierarchy (Imai and Nalbandov, 1978;Culbert et al 1980; Etches and Duke, 1984). The observation that plasma progesterone concentrations reached a maximum at the peak of egg-laying is consistent with this idea.…”

Section: Husbandry and Behavioural Observationsmentioning

confidence: 58%

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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Effect of ovine LH on the progesterone content of the granulosa cells in preovulatory follicles of the domestic fowl (Gallus domesticus)

Cited by 27 publications

References 13 publications

3β-Hydroxy-Δ5-steroid dehydrogenase activity in the rapidly growing ovarian follicles of the domestic fowl (Gallus domesticus)

3β-Hydroxy-Δ5-steroid dehydrogenase activity in the rapidly growing ovarian follicles of the domestic fowl (Gallus domesticus)

Changes in the plasma concentrations of prolactin, luteinising hormone, progesterone andd‐(β)‐hydroxybutyrate in turkey hens (meleagris gallopavo), during treatment of broodiness under commercial conditions

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

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