Endocronological and behavioural effects of p-chlorophenylalanine (PCPA) oral administration to broody turkey hens (Meleagris gallopavo)

Guemene, Daniel D.; Etches, R. J.

doi:10.1051/rnd:19890408

Cited by 12 publications

(8 citation statements)

References 8 publications

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“…In addition, the changes in plasma concentrations of LH and prolactin were not always inversely correlated. Similar desynchronisations in the changes in the concentration of these 2 hormones have already been reported (Sharp et al, 1988(Sharp et al, , 1989Guémené and Etches, 1989).…”

Section: Discussionsupporting

confidence: 80%

Behaviour and hormone concentrationsin nest deprived and renesting hens

Ma¹,

Guemene²,

Lea³

et al. 1998

British Poultry Science

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1. Nest and egg deprivation is a procedure traditionally used to disrupt incubation behaviour expression in commercial flocks. The aim of this study was to establish how nest deprivation affects the subsequent changes in behaviour and hormone secretion and whether readiness to renest is related to hormone concentration before and during nest deprivation. 2. Incubating broiler breeder hens were deprived of their nest either in their familiar environment, by blocking the nest entrance in the home cage or in an unfamiliar environment, by transfer in a different cage. After 3 days of nest deprivation, next access was allowed and readiness to incubate tested. 3. Both methods of nest deprivation resulted in the expression of similar behaviours associated with the disruption of incubation, and similar increases in plasma LH and oestradiol and decreases in plasma prolactin. The percentage (approximately 70%) of hens which renested after either method of nest deprivation did not differ significantly. 4. Readiness to renest was not related to the concentrations of plasma prolactin measured before or during the 3 days of nest deprivation. However, hens which would later renest could be identified by using behavioural criteria. They emitted more avoidance trills before, and sat on the wire floor for longer periods during, the nest deprivation period than the others.

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Section: Discussionsupporting

confidence: 80%

Behaviour and hormone concentrationsin nest deprived and renesting hens

Ma¹,

Guemene²,

Lea³

et al. 1998

British Poultry Science

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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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“…A decline in circulating prolactin was measured for all hens during treatment. Maintenance of broodiness is dependent on high concentrations of prolactin (El Halawani et al, 1986;Sharp et al, 1988), and a decline in prolactin does precede pharmacologically induced disruption of broodiness (El Halawani et al, 1983;Guemene and Etches, 1989). Therefore, the present results suggest that this management practice effectively prevents the full expression of broody behaviour.…”

Section: Discussionmentioning

confidence: 57%

“…Although the increase in prolactin secretion at the onset of broodiness does not strictly inhibit egg production or depress plasma luteinising hormone (Lea and Sharp, 1982;Guemene and Etches, 1989), it is thought to be causally involved in the decrease in LH, the subsequent decrease in progesterone concentrations and the termination of lay, all of which are associated with the onset of broodiness (Cogger et al, 1979;Burke and Dennison, 1980;El Halawani et al, 1980;Harvey and Bedrak, 1984;Sharps a;., 1988).…”

Section: Introductionmentioning

confidence: 99%

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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Endocronological and behavioural effects of p-chlorophenylalanine (PCPA) oral administration to broody turkey hens (Meleagris gallopavo)

Cited by 12 publications

References 8 publications

Behaviour and hormone concentrationsin nest deprived and renesting hens

Behaviour and hormone concentrationsin nest deprived and renesting hens

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

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

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