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Registro Completo |
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Biblioteca(s): |
Embrapa Caprinos e Ovinos. |
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Data corrente: |
22/06/2017 |
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Data da última atualização: |
22/06/2017 |
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Autoria: |
BASSETT, J. M.; CURTIS, N.; HANSON, C.; WEEDING C. M. |
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Título: |
Effects of altered photoperiod or maternal melatonin administration on plasma prolactin concentrations in fetal lambs. |
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Ano de publicação: |
1989 |
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Fonte/Imprenta: |
Journal of Endocrinology, v. 122, n. 3, p. 633-644, Jul. 1989. |
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DOI: |
0.1677/joe.0.1220633 |
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Idioma: |
Inglês |
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Conteúdo: |
Abstract: During winter (December to March), when late-pregnant ewes were maintained under an artificial long-day photoperiod (16 h light) for 3 weeks or more before insertion of fetal vascular cannulae between 118 and 120 days of gestation (full term, 147 days), plasma prolactin concentrations in their fetal lambs were significantly increased throughout the last 3 weeks of gestation in comparison with values in similar aged fetuses from ewes experiencing only the natural short-day (less than 9 h light) winter photoperiod. When additional lighting was given only after vascular cannulation, fetal plasma prolactin increased steadily from low values, characteristic of winter pregnancies, to high values, characteristic of long-day (16 h light:8 h darkness) pregnancies. Maternal plasma prolactin concentrations changed in a similar way. During summer pregnancies (greater than 16 h light), plasma prolactin in fetal lambs was significantly reduced within 48 h when ewes were given melatonin by i.v. infusion for 14 h each night to simulate the winter duration of the nocturnal increase in plasma melatonin. Maternal plasma prolactin concentrations also decreased significantly when melatonin was given for 3 weeks, but not in a shorter experiment. Increases in fetal plasma prolactin were proportional to the basal prolactin concentration in fetuses injected i.v. with TRH or a dopaminergic antagonist, metoclopramide, to assess how photoperiod influenced the responsiveness of prolactin secretion to acute stimulation. The results confirm that photoperiod, rather than developmental maturity, is the principal determinant of plasma prolactin in the fetal lamb during the last third of gestation, and provide evidence that photoperiodic information is transmitted to the fetus through the diurnal rhythm of melatonin in the ewe. MenosAbstract: During winter (December to March), when late-pregnant ewes were maintained under an artificial long-day photoperiod (16 h light) for 3 weeks or more before insertion of fetal vascular cannulae between 118 and 120 days of gestation (full term, 147 days), plasma prolactin concentrations in their fetal lambs were significantly increased throughout the last 3 weeks of gestation in comparison with values in similar aged fetuses from ewes experiencing only the natural short-day (less than 9 h light) winter photoperiod. When additional lighting was given only after vascular cannulation, fetal plasma prolactin increased steadily from low values, characteristic of winter pregnancies, to high values, characteristic of long-day (16 h light:8 h darkness) pregnancies. Maternal plasma prolactin concentrations changed in a similar way. During summer pregnancies (greater than 16 h light), plasma prolactin in fetal lambs was significantly reduced within 48 h when ewes were given melatonin by i.v. infusion for 14 h each night to simulate the winter duration of the nocturnal increase in plasma melatonin. Maternal plasma prolactin concentrations also decreased significantly when melatonin was given for 3 weeks, but not in a shorter experiment. Increases in fetal plasma prolactin were proportional to the basal prolactin concentration in fetuses injected i.v. with TRH or a dopaminergic antagonist, metoclopramide, to assess how photoperiod influenced the responsiveness of prolactin secre... Mostrar Tudo |
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Palavras-Chave: |
Fetal Exchange; Foetus; Maternal behaviour; Releasing Hormone. |
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Thesaurus Nal: |
Melatonin; Metabolism; metoclopramide; Pharmacology; Pregnancy; Prolactin; Sheep; Thyrotropin. |
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Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
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Marc: |
LEADER 02703naa a2200313 a 4500
001 2071352
005 2017-06-22
008 1989 bl uuuu u00u1 u #d
024 7 $a0.1677/joe.0.1220633$2DOI
100 1 $aBASSETT, J. M.
245 $aEffects of altered photoperiod or maternal melatonin administration on plasma prolactin concentrations in fetal lambs.
260 $c1989
520 $aAbstract: During winter (December to March), when late-pregnant ewes were maintained under an artificial long-day photoperiod (16 h light) for 3 weeks or more before insertion of fetal vascular cannulae between 118 and 120 days of gestation (full term, 147 days), plasma prolactin concentrations in their fetal lambs were significantly increased throughout the last 3 weeks of gestation in comparison with values in similar aged fetuses from ewes experiencing only the natural short-day (less than 9 h light) winter photoperiod. When additional lighting was given only after vascular cannulation, fetal plasma prolactin increased steadily from low values, characteristic of winter pregnancies, to high values, characteristic of long-day (16 h light:8 h darkness) pregnancies. Maternal plasma prolactin concentrations changed in a similar way. During summer pregnancies (greater than 16 h light), plasma prolactin in fetal lambs was significantly reduced within 48 h when ewes were given melatonin by i.v. infusion for 14 h each night to simulate the winter duration of the nocturnal increase in plasma melatonin. Maternal plasma prolactin concentrations also decreased significantly when melatonin was given for 3 weeks, but not in a shorter experiment. Increases in fetal plasma prolactin were proportional to the basal prolactin concentration in fetuses injected i.v. with TRH or a dopaminergic antagonist, metoclopramide, to assess how photoperiod influenced the responsiveness of prolactin secretion to acute stimulation. The results confirm that photoperiod, rather than developmental maturity, is the principal determinant of plasma prolactin in the fetal lamb during the last third of gestation, and provide evidence that photoperiodic information is transmitted to the fetus through the diurnal rhythm of melatonin in the ewe.
650 $aMelatonin
650 $aMetabolism
650 $ametoclopramide
650 $aPharmacology
650 $aPregnancy
650 $aProlactin
650 $aSheep
650 $aThyrotropin
653 $aFetal Exchange
653 $aFoetus
653 $aMaternal behaviour
653 $aReleasing Hormone
700 1 $aCURTIS, N.
700 1 $aHANSON, C.
700 1 $aWEEDING C. M.
773 $tJournal of Endocrinology$gv. 122, n. 3, p. 633-644, Jul. 1989.
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Registro original: |
Embrapa Caprinos e Ovinos (CNPC) |
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Registro Completo
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Biblioteca(s): |
Embrapa Trigo. |
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Data corrente: |
10/08/2016 |
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Data da última atualização: |
20/12/2018 |
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Tipo da produção científica: |
Artigo em Anais de Congresso |
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Autoria: |
CONSOLI, L.; AGUILERA, J. G.; BARCELLOS, P. A. D.; BONATO, A. L. V.; NHANI JUNIOR, A.; TORRES, G. A. M.; PEREIRA, J. F.; NICOLAU, M.; SÓ e SILVA, M. |
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Afiliação: |
LUCIANO CONSOLI, CNPT; JORGE GONZALEZ AGUILERA; PEDRO ARNALDO DUARTE BARCELLOS; ANA LIDIA VARIANI BONATO, CNPT; ANTONIO NHANI JUNIOR, CNPT; GISELE ABIGAIL MONTAN TORRES, CNPT; JORGE FERNANDO PEREIRA, CNPT; MARCIO NICOLAU, CNPT; MÁRCIO SÓ E SILVA, CNPT. |
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Título: |
Identificação de regiões genômicas por GWAS em trigo associadas à tolerância à seca - primeiros resultados. |
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Ano de publicação: |
2016 |
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Fonte/Imprenta: |
In: REUNIÃO DA COMISSÃO BRASILEIRA DE PESQUISA DE TRIGO E TRITICALE, 10., 2016, Londrina. Anais... Londrina: Comissão Brasileira de Pesquisa de Trigo e Triticale, 2016. |
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Páginas: |
5 p. |
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Descrição Física: |
1 CD-ROM. |
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Idioma: |
Português |
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Palavras-Chave: |
Associação genômica ampla; Estresse hídrico; GWAS; SNPs. |
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Thesagro: |
Trigo. |
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Categoria do assunto: |
G Melhoramento Genético |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/146246/1/ID43731-2016RCBPTT10CONSOLI78.pdf
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Marc: |
LEADER 00924nam a2200265 a 4500
001 2050676
005 2018-12-20
008 2016 bl uuuu u00u1 u #d
100 1 $aCONSOLI, L.
245 $aIdentificação de regiões genômicas por GWAS em trigo associadas à tolerância à seca - primeiros resultados.$h[electronic resource]
260 $aIn: REUNIÃO DA COMISSÃO BRASILEIRA DE PESQUISA DE TRIGO E TRITICALE, 10., 2016, Londrina. Anais... Londrina: Comissão Brasileira de Pesquisa de Trigo e Triticale$c2016
300 $a5 p.$c1 CD-ROM.
650 $aTrigo
653 $aAssociação genômica ampla
653 $aEstresse hídrico
653 $aGWAS
653 $aSNPs
700 1 $aAGUILERA, J. G.
700 1 $aBARCELLOS, P. A. D.
700 1 $aBONATO, A. L. V.
700 1 $aNHANI JUNIOR, A.
700 1 $aTORRES, G. A. M.
700 1 $aPEREIRA, J. F.
700 1 $aNICOLAU, M.
700 1 $aSÓ e SILVA, M.
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Embrapa Trigo (CNPT) |
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