Effect of constant-release melatonin implants and prolonged exposure to a long day photoperiod on prolactin secretion and hair growth in mouflon (Ovis gmelini musimon)
The aims of this study were to examine whether mouflons exposed to constant long and short day photoperiods are able to exhibit an annual cycle of hair growth and moult, and prolactin (PRL) secretion. Mouflon ewes were assigned to three groups of treatment. Ewes were maintained, either under natural photoperiod (control, n=9), or received a series of subcutaneous melatonin implants from December to April (n=8), or were exposed to a constant long day photoperiod (16-hlight8-hdark; 16L8D) during 18 months (n=7). Blood was collected weekly to determine PRL concentrations, and hair samples were clipped weekly from the base of the neck to measure the length of predominant hair. Under constant long days and with melatonin implants, mouflons expressed an annual rhythm of PRL secretion, even though these treatments modified the times of rise or falling of PRL concentrations throughout the year. Hair growth initiation was almost coincident with the summer solstice in both control and melatonin-implanted mouflons but occurred two months earlier in long day hold mouflons (P<0.001). Long day hold mouflons had a lower hair growth rate than control and melatonin-implanted mouflons (P<0.001), and at the end of the experiment, a shorter hair length (3.4±0.24cm; P<0.01) than control (4.3±0.17cm), and melatonin-implanted mouflons (4.2±0.12cm). Our data support the conclusion that in mouflon, an endogenous circannual rhythm of PRL secretion exists, and that the seasonal cycle of hair growth and moult appears to depend, at least in part, on circulating levels of PRL. © 2004 Elsevier Inc. All rights reserved.
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Format: | artículo biblioteca |
Language: | English |
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Elsevier
2004
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Subjects: | Prolactin, Hair, Artificial photoperiod, Melatonin implant, Mouflon, |
Online Access: | http://hdl.handle.net/20.500.12792/4189 http://hdl.handle.net/10261/290940 |
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dig-inia-es-10261-2909402023-02-17T12:31:11Z Effect of constant-release melatonin implants and prolonged exposure to a long day photoperiod on prolactin secretion and hair growth in mouflon (Ovis gmelini musimon) Santiago Moreno, Julián López Sebastián, Antonio del Campo, A. González De Bulnes, Antonio Picazo, R. Gómez-Brunet, A. Prolactin Hair Artificial photoperiod Melatonin implant Mouflon The aims of this study were to examine whether mouflons exposed to constant long and short day photoperiods are able to exhibit an annual cycle of hair growth and moult, and prolactin (PRL) secretion. Mouflon ewes were assigned to three groups of treatment. Ewes were maintained, either under natural photoperiod (control, n=9), or received a series of subcutaneous melatonin implants from December to April (n=8), or were exposed to a constant long day photoperiod (16-hlight8-hdark; 16L8D) during 18 months (n=7). Blood was collected weekly to determine PRL concentrations, and hair samples were clipped weekly from the base of the neck to measure the length of predominant hair. Under constant long days and with melatonin implants, mouflons expressed an annual rhythm of PRL secretion, even though these treatments modified the times of rise or falling of PRL concentrations throughout the year. Hair growth initiation was almost coincident with the summer solstice in both control and melatonin-implanted mouflons but occurred two months earlier in long day hold mouflons (P<0.001). Long day hold mouflons had a lower hair growth rate than control and melatonin-implanted mouflons (P<0.001), and at the end of the experiment, a shorter hair length (3.4±0.24cm; P<0.01) than control (4.3±0.17cm), and melatonin-implanted mouflons (4.2±0.12cm). Our data support the conclusion that in mouflon, an endogenous circannual rhythm of PRL secretion exists, and that the seasonal cycle of hair growth and moult appears to depend, at least in part, on circulating levels of PRL. © 2004 Elsevier Inc. All rights reserved. 2023-02-17T12:31:10Z 2023-02-17T12:31:10Z 2004 artículo Domestic Animal Endocrinology 26(4): 303-314 (2004) 0739-7240 http://hdl.handle.net/20.500.12792/4189 http://hdl.handle.net/10261/290940 10.1016/j.domaniend.2003.12.004 1879-0054 en none Elsevier |
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Prolactin Hair Artificial photoperiod Melatonin implant Mouflon Prolactin Hair Artificial photoperiod Melatonin implant Mouflon |
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Prolactin Hair Artificial photoperiod Melatonin implant Mouflon Prolactin Hair Artificial photoperiod Melatonin implant Mouflon Santiago Moreno, Julián López Sebastián, Antonio del Campo, A. González De Bulnes, Antonio Picazo, R. Gómez-Brunet, A. Effect of constant-release melatonin implants and prolonged exposure to a long day photoperiod on prolactin secretion and hair growth in mouflon (Ovis gmelini musimon) |
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The aims of this study were to examine whether mouflons exposed to constant long and short day photoperiods are able to exhibit an annual cycle of hair growth and moult, and prolactin (PRL) secretion. Mouflon ewes were assigned to three groups of treatment. Ewes were maintained, either under natural photoperiod (control, n=9), or received a series of subcutaneous melatonin implants from December to April (n=8), or were exposed to a constant long day photoperiod (16-hlight8-hdark; 16L8D) during 18 months (n=7). Blood was collected weekly to determine PRL concentrations, and hair samples were clipped weekly from the base of the neck to measure the length of predominant hair. Under constant long days and with melatonin implants, mouflons expressed an annual rhythm of PRL secretion, even though these treatments modified the times of rise or falling of PRL concentrations throughout the year. Hair growth initiation was almost coincident with the summer solstice in both control and melatonin-implanted mouflons but occurred two months earlier in long day hold mouflons (P<0.001). Long day hold mouflons had a lower hair growth rate than control and melatonin-implanted mouflons (P<0.001), and at the end of the experiment, a shorter hair length (3.4±0.24cm; P<0.01) than control (4.3±0.17cm), and melatonin-implanted mouflons (4.2±0.12cm). Our data support the conclusion that in mouflon, an endogenous circannual rhythm of PRL secretion exists, and that the seasonal cycle of hair growth and moult appears to depend, at least in part, on circulating levels of PRL. © 2004 Elsevier Inc. All rights reserved. |
format |
artículo |
topic_facet |
Prolactin Hair Artificial photoperiod Melatonin implant Mouflon |
author |
Santiago Moreno, Julián López Sebastián, Antonio del Campo, A. González De Bulnes, Antonio Picazo, R. Gómez-Brunet, A. |
author_facet |
Santiago Moreno, Julián López Sebastián, Antonio del Campo, A. González De Bulnes, Antonio Picazo, R. Gómez-Brunet, A. |
author_sort |
Santiago Moreno, Julián |
title |
Effect of constant-release melatonin implants and prolonged exposure to a long day photoperiod on prolactin secretion and hair growth in mouflon (Ovis gmelini musimon) |
title_short |
Effect of constant-release melatonin implants and prolonged exposure to a long day photoperiod on prolactin secretion and hair growth in mouflon (Ovis gmelini musimon) |
title_full |
Effect of constant-release melatonin implants and prolonged exposure to a long day photoperiod on prolactin secretion and hair growth in mouflon (Ovis gmelini musimon) |
title_fullStr |
Effect of constant-release melatonin implants and prolonged exposure to a long day photoperiod on prolactin secretion and hair growth in mouflon (Ovis gmelini musimon) |
title_full_unstemmed |
Effect of constant-release melatonin implants and prolonged exposure to a long day photoperiod on prolactin secretion and hair growth in mouflon (Ovis gmelini musimon) |
title_sort |
effect of constant-release melatonin implants and prolonged exposure to a long day photoperiod on prolactin secretion and hair growth in mouflon (ovis gmelini musimon) |
publisher |
Elsevier |
publishDate |
2004 |
url |
http://hdl.handle.net/20.500.12792/4189 http://hdl.handle.net/10261/290940 |
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