Endocrine Changes in the Pig During Late Pregnancy, Parturition and Lactation1

Baldwin, David M.; Stabenfeldt, G. H.

doi:10.1095/biolreprod12.4.508

Cited by 82 publications

(47 citation statements)

References 23 publications

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“…On the contrary, plasma E2 increased towards the end of gestation, peaked at the beginning of parturition and dropped thereafter. This was in agreement with previous studies [26,29] and is related to the fact that E2 is produced mainly by the placentas [30,31]. The very rapid decrease at parturition is therefore the consequence of the removal of the foeto-placental units.…”

Section: Plasma Hormones Lactose and Igg Variations Around Parturitionsupporting

confidence: 93%

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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Section: Plasma Hormones Lactose and Igg Variations Around Parturitionsupporting

confidence: 93%

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

et al. 2004

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“…In the camel, progesterone production has been reported to decline starting at 5 months of pregnancy (Elias et ai, 1984b). The final decline in plasma progesterone concentrations began 24-48 h pre partum, temporal changes similar to those reported in some other species (Bassett et ai, 1969;Pope et ai, 1969;Stabenfeldt et ai, 1972;Chamley et ai, 1973;Smith et ai, 1973;Challis et ai, 1974;Robertson & King, 1974;Ash & Heap, 1975;Baldwin & Stabenfeldt, 1975;Fairclough et ai, 1975b;Hunter et ai, 1977).…”

Section: Discussionsupporting

confidence: 74%

Endocrine changes during pregnancy, parturition and the early post-partum period in the llama (Lama glama)

Leon

Smith²,

Timm³

et al. 1990

Reproduction

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Summary. Mean ( \ m=+-\ s.d.) pregnancy length for the 14 llamas in this study was 350 \ m=+-\ 4\ m=. \ 5 days. Plasma progesterone concentrations increased by 5 days after mating and remained elevated (>2\m=.\0ng/ml) throughout most of pregnancy. At about 2 weeks before parturition, plasma progesterone concentrations began to decline, dropped markedly during the final 24 h before parturition, and returned to basal concentrations (<0\m=.\5ng/ml) by the day of parturition. The combined oestrone + oestradiol-17\g=b\ and oestradiol-17\g=b\ concentrations varied between 6 and 274 pg/ml and 4 and 114 pg/ml, respectively, during the first 9 months of pregnancy. Concentrations increased between 9 months after mating and the end of pregnancy with peak mean concentrations of 827 \ m=+-\ 58 (s.e.m.) pg oestrone + oestradiol-17\g=b\/ml(range: 64\p=n-\1658) and 196 \ m=+-\ 10 pg oestradiol-17\g=b\/ml(31\p=n-\294)during the last week of pregnancy. Concentrations then declined to 87 \ m=+-\14 pg oestrone + oestradiol-17\g=b\/ml(7\p=n-\488) and 25 \ m=+-\5 pg oestradiol17\g=b\/ml (2\m=.\5\p=n-\142)during the first week postpartum. Plasma cortisol concentrations varied between 2\m=.\6and 51\m=.\9 ng/ml (14\m=.\0 \ m=+-\ 0\m=.\5) from mating until 2 weeks before parturition when the concentrations began to decline. Only a slight increase in plasma cortisol concentrations was observed in association with parturition. Plasma triiodothyronine concentrations varied between 0\m=.\5and 4\m=.\5 ng/ml (1\m=.\9 \m=+-\ 0\m=.\1)throughout pregnancy and the periparturient period. Plasma thyroxine concentrations varied between 21\m=.\3and 91\m=.\5ng/ml (56\m=.\5\ m=+-\ 0\m=.\8) from mating until about 39 weeks of pregnancy when they began to decline, from 43\m=.\0 \ m=+-\ 5\m=.\3 ng/ml at 15 days pre partum to 23\m=.\5\m=+-\ 5\m=.\5 ng/ml immediately before parturition, but then increased to 52\m=.\8\ m=+-\ 3\m=.\9 ng/ml by 1 day post partum.

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“…No particular changes in plasma corticosteroids are noticeable during late gestation until 1 -2 days prior to parturition (Killian et al, 1973;Molokwu and Wagner, 1973;Fdvre, 1974;Baldwin and Stabenfeldt, 1975). Obviously there is no decisive role corticosteroids play at this early stage.…”

Section: Late Gestationmentioning

confidence: 99%

“…41 to 17 hrs before parturition, however, progesterone values fluctuated erratically on a lower level and were independent of the still present LH episodes. This effect is likely to start earlier than 48 hrs prior to parturition, since there is general agreement, that progesterone has commenced its decline by then (Killian et al, 1973;Molokwu and Wagner, 1973;Robertson and King, 1974;Baldwin and Stabenfeldt, 1975;Parvizi et al, 1976).…”

Section: Late Gestationmentioning

confidence: 99%