Oestrogen, Progesterone and Corticosteroid Concentrations in Peripheral Plasma of Sows During Pregnancy, Parturition, Lactation and After Weaning

Ash, R. W.; Heap, R. B.

doi:10.1677/joe.0.0640141

Cited by 149 publications

(72 citation statements)

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“…The peripheral plasma progesterone and oestradiol-17~ concentrations found in this study closely resemble those reported by Robertson and King (1974), Ash and Heap (1975) and F~vre et al (1975) and indicate that spontaneous parturition occurs after a change in their ratio.…”

Section: Discussionsupporting

confidence: 90%

Plasma prolactin, progesterone and oestradiol-17β concentrations around parturition in the pig

Taverne

Willemse

Dieleman

et al. 1979

Animal Reproduction Science

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Taverne, M., Willemse, A.H., Dieleman, S.J. and Bevers, M., 1978/1979. Plasma prolactin, progesterone and oestradiol-17~ concentrations around parturition in the pig. Anim. Reprod. Sci., 1: 257--263.Plasma concentrations of prolactin, progesterone and oestradiol-17~ were measured by radioimmunoassay in samples taken from 2--15 days before until 1--4 days after spontaneous parturition in four sows and in one sow around prostaglandin F2(~-induced parturition.Between Days --15 and --2 (Day 0 = parturition), prolactin concentrations in daily samples fluctuated somewhat, but exceeded 10 ng/ml only exceptionally. Plasma progesterone levels gradually declined or remained high until about 2 days before parturition. A final decrease of the progesterone concentrations coincided with distinct increases of the prolactin levels during the last 40 h of pregnancy.Maximal prolactin concentrations were measured before the onset of delivery of the piglets. Oestradiol-17~ reached peak values around delivery. Prostaglandin F2~ injection caused an immediate sharp increase of the prolactin concentration which lasted for about 6 h. During this period progesterone and oestradiol-17~ concentrations did not change. A second elevation of prolactin levels was measured when progesterone finally decreased.Changes of prolactin concentrations found in this study were compared with those found in other domestic animals at the same reproductive stage.

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Section: Discussionsupporting

confidence: 90%

Plasma prolactin, progesterone and oestradiol-17β concentrations around parturition in the pig

Taverne

Willemse

Dieleman

et al. 1979

Animal Reproduction Science

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“…Plasma P4 decreased slowly during the days preceding parturition and more rapidly just before and during parturition as already described [24][25][26]. This decrease is due to the regression of the corpora lutea [27,28].…”

Section: Plasma Hormones Lactose and Igg Variations Around Parturitionmentioning

confidence: 52%

Hormones, IgG and lactose changes around parturition in plasma, and colostrum or saliva of multiparous sows

et al. 2004

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-Blood, colostrum and saliva samples were serially taken from 6 multiparous sows from day 109 of gestation until day 3 postpartum. Plasma was assayed for oestradiol-17β (E2), progesterone (P4), prolactin (PRL), cortisol, immunoglobulin G (IgG) and lactose. Colostrum was assayed for E2, P4, IgG and lactose. Lactoserum, obtained after ultra centrifugation of colostrum, was assayed for PRL. Saliva was assayed for cortisol. Time-related variations in hormone, IgG and lactose concentrations measured in plasma were parallel to those measured in colostrum, lactoserum or saliva. However, the concentrations were higher in colostrum or lactoserum and lower in saliva than in plasma. Ratios of concentrations of cortisol in saliva and PRL in lactoserum over those in plasma did not vary with time and averaged 0.2 and 1.6, respectively. Conversely, the ratios of concentrations of E2 and P4 in colostrum over those in plasma varied with time (P < 0.05) but were quite constant before the end of parturition, averaging 2.7 and 3.6, respectively. The ratios of concentrations of IgG and lactose in colostrum over those in plasma also varied with time (P < 0.05). The concentrations of hormones in plasma on the one hand and in colostrum, lactoserum or saliva on the other hand were significantly correlated but correlations varied with time (PRL across periods: r = 0.31; cortisol across periods: r = 0.60; E2 during parturition: r = 0.83; P4 before parturition: r = 0.82; P4 during parturition: r = 0.67). The present results indicate that around parturition, assays of hormones in colostrum or saliva can be used to study the hormonal status of sows. Furthermore, variations in colostrum and plasma concentrations of IgG and lactose are good indicators of the transition from colostrum to milk synthesis. sow / parturition / steroid / prolactin / lactose / immunoglobulins

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“…In the sow, parturition is preceded by the regression of the corpus luteum of pregnancy and the withdrawal of progesterone from the maternal circulation (Ash & Heap, 1975). The initiation of parturition was significantly delayed (P < 0-001) in all meclofenamic acid-treated sows.…”

Section: Discussionmentioning

confidence: 91%

Influence of meclofenamic acid on the initiation of parturition and lactation in the sow

Gooneratne¹,

Hartmann²,

Barker³

1982

Reproduction

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Oestrogen, Progesterone and Corticosteroid Concentrations in Peripheral Plasma of Sows During Pregnancy, Parturition, Lactation and After Weaning

Cited by 149 publications

References 0 publications

Plasma prolactin, progesterone and oestradiol-17β concentrations around parturition in the pig

Plasma prolactin, progesterone and oestradiol-17β concentrations around parturition in the pig

Hormones, IgG and lactose changes around parturition in plasma, and colostrum or saliva of multiparous sows

Influence of meclofenamic acid on the initiation of parturition and lactation in the sow

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