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Registro Completo |
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Biblioteca(s): |
Embrapa Caprinos e Ovinos. |
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Data corrente: |
01/08/1992 |
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Data da última atualização: |
27/06/2023 |
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Autoria: |
DAVIS, A. J.; FLEET, I. R.; GOODE, J. A.; HAMON, M. H.; WALKER, F. M.; PEAKER, M. |
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Título: |
Changes in mammary function at the onset of lactation in the goat: correlation with hormonal changes. |
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Ano de publicação: |
1979 |
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Fonte/Imprenta: |
Journal of Physiology, v. 288, p. 33-44, 1979. |
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Idioma: |
Inglês |
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Conteúdo: |
1. Changes in mammary function and plasma hormone concentrations during late pregnancy and the onset of lactation have been studied in conscious goats. 2. Mammary blood flow, oxygen consumption and glucose uptake increased markedly and significantly between 2 days and 0.5-1 day pre-partum. 3. The increase in mammary glucose uptake was relatively greater than that of oxygen consumption or blood flow. 4. The concentration of citrate in mammary secretion incresed; the first significant change was apparent 0.5-1 day pre-partum but the main rise occurred after this time. 5. It is concluded that marked increase in mammary glucose uptake 0.5-1 day before parturition indicates the time of onset of copious milk secretion. 6. The first significant increase in the concentration of unconjugated oestrogens in arterial plasma occurred 3 days pre-partum, whereas the first significant decrease in progesterone and increase in 13,14-dihydro-15-oxoprostaglandin F2x occurred 0.5-1 day pre-partum, thus coinciding with the mammary changes; there was also a peak in prolactin concentrations at the latter time. 7. The hormonal changes are discussed in relation to current concepts of the initiation of parturition and the onset of copious milk secretion in this species. It is suggested that the fall in plasma progesterone concentrations triggers milk secretion at high rates. |
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Palavras-Chave: |
Blood supply; Milk metabolism; Reproducao fisiologica. |
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Thesagro: |
Caprino; Glândula Mamaria. |
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Thesaurus Nal: |
Endocrinology; Estrogens; Glucose; Goats; Lactation; Mammary glands; Oxygen consumption; Physiology; Pregnancy; Progesterone. |
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Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
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Marc: |
LEADER 02341naa a2200361 a 4500
001 1521233
005 2023-06-27
008 1979 bl uuuu u00u1 u #d
100 1 $aDAVIS, A. J.
245 $aChanges in mammary function at the onset of lactation in the goat$bcorrelation with hormonal changes.$h[electronic resource]
260 $c1979
520 $a1. Changes in mammary function and plasma hormone concentrations during late pregnancy and the onset of lactation have been studied in conscious goats. 2. Mammary blood flow, oxygen consumption and glucose uptake increased markedly and significantly between 2 days and 0.5-1 day pre-partum. 3. The increase in mammary glucose uptake was relatively greater than that of oxygen consumption or blood flow. 4. The concentration of citrate in mammary secretion incresed; the first significant change was apparent 0.5-1 day pre-partum but the main rise occurred after this time. 5. It is concluded that marked increase in mammary glucose uptake 0.5-1 day before parturition indicates the time of onset of copious milk secretion. 6. The first significant increase in the concentration of unconjugated oestrogens in arterial plasma occurred 3 days pre-partum, whereas the first significant decrease in progesterone and increase in 13,14-dihydro-15-oxoprostaglandin F2x occurred 0.5-1 day pre-partum, thus coinciding with the mammary changes; there was also a peak in prolactin concentrations at the latter time. 7. The hormonal changes are discussed in relation to current concepts of the initiation of parturition and the onset of copious milk secretion in this species. It is suggested that the fall in plasma progesterone concentrations triggers milk secretion at high rates.
650 $aEndocrinology
650 $aEstrogens
650 $aGlucose
650 $aGoats
650 $aLactation
650 $aMammary glands
650 $aOxygen consumption
650 $aPhysiology
650 $aPregnancy
650 $aProgesterone
650 $aCaprino
650 $aGlândula Mamaria
653 $aBlood supply
653 $aMilk metabolism
653 $aReproducao fisiologica
700 1 $aFLEET, I. R.
700 1 $aGOODE, J. A.
700 1 $aHAMON, M. H.
700 1 $aWALKER, F. M.
700 1 $aPEAKER, M.
773 $tJournal of Physiology$gv. 288, p. 33-44, 1979.
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Registro original: |
Embrapa Caprinos e Ovinos (CNPC) |
