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Journal of Endocrinology (1988) 117, 397-402       DOI: 10.1677/joe.0.1170397
© 1988 Society for Endocrinology
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Pituitary and plasma vasopressin concentrations and fluid balance throughout the oestrous cycle of the rat

 M. L. Forsling and K. Peysner

Observations were made of fluid balance and vasopressin concentrations throughout the oestrous cycle of normally cyclic female rats housed under a 12 h light: 12 h darkness regime. Plasma vasopressin concentrations were found to increase progressively during the light period, falling again during the night on all days of the cycle except pro-oestrus. On this day, peak vasopressin concentrations of 3·32 ± 0·8 pmol/l were seen between 10.00 and 12.00 h, with lower concentrations of 1·74± 0·22 pmol/l being seen between 18.00 and 19.00 h. Urine flow appeared to reflect the changes in plasma vasopressin concentrations, being significantly lower during the light phase, with a small increase being seen over this period on pro-oestrus. Pituitary vasopressin concentrations were highest between 09.00 and 10.00 h and fell progressively over each of the 4 days of the oestrous cycle. The changes in pituitary content were greater than could be accounted for in terms of the alterations in the plasma concentrations of vasopressin.

J. Endocr. (1988) 117, 397–402




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