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- W2077302440 abstract "Plasma renin activity (PRA) and plasma aldosterone concentration (PAC) were compared in 8 goats (5 delivering twins = TP, 3 delivering one kid = SP) during pregnancy, lactation, and anestrus during sodium replete and sodium deplete conditions. Sodium depletion was provoked by intravenous infusions of furosemide (10 mg followed by 0.2 mg/min for 3 h) causing huge natriuresis and kaliuresis. The drinking response was not sufficient to compensate for the renal water loss. The plasma Na concentration had fallen by 1–2 mmol/1 the day after the infusion and the plasma K concentration fell during the infusion by 0.4 to 0.6 mmol/1 and remained low the day after the infusion. Total plasma protein increased by 7 g/1 (pregnancy and lactation) and by 11 g/1 (anestrus) and the hematocrit by about 2% during the infusions. PRA and PAC differed markedly in SP goats vs TP goats and during pregnancy vs lactation and anestrus. In sodium replete pregnant TP goats, PRA was higher than during lactation or anestrus and in these animals, furosemide caused a large elevation of PRA, which remained elevated also the day after the infusion. The mean PAC was elevated in sodium replete pregnant TP goats and furosemide infusions induced further increases in mean PAC values. However, the individual differences were large, and only 3 of the 5 TP goats were responsible for these effects. PRA of sodium replete SP goats were not elevated during pregnancy and the response in PRA to furosemide was similar during pregnancy, lactation and anestrus. Basal PAC of the SP goats was of the same order during pregnancy, lactation and anestrus. 2 TP and 2 SP goats were subjected to a load of hypertonic NaCl, and they excreted the extra Na as efficiently during pregnancy as during anestrus. During the NaCl infusions the goats drank double the amount during pregancy as compared to their consumption during anestrus. PAC fell in all animals but after the NaCl infusions the PAC returned to initial values or above within 2 h in the TP goats but not in the SP goats. Glomerular filtration rate was found to be higher in two TP goats with elevated basic PAC than in two TP goats with low basal PAC values. The role of the renin-angiotensin-aldosterone system during pregnancy is discussed in relation to the arterial pressure, to the levels of progesterone and estrogen, and to the water intake in pregnant goats. The inconsistent correlation between PRA and PAC indicates a possible hyperreactivity of the adrenal cortex in some pregnant TP goats." @default.
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- W2077302440 date "1983-07-01" @default.
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- W2077302440 title "Plasma renin activity and plasma aldosterone concentration in pregnant and lactating goats in different sodium states" @default.
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- W2077302440 doi "https://doi.org/10.1111/j.1748-1716.1983.tb07270.x" @default.
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