Wolf J P, Davicco M J, Giry J, Barlet J P
Laboratoire de Physiologie Médicale, Faculté de Médecine, Besancon, France.
J Dev Physiol. 1991 Dec;16(6):363-6.
Diurnal changes in plasma ANF and AVP levels were investigated in four calves under standardized conditions. Both levels in plasma were measured at hourly intervals for 24 h along with arterial blood pressure, blood haematocrit, plasma cGMP, sodium, potassium, osmolality, proteins and albumin. Plasma ANF exhibited a first peak at mid-day while plasma AVP was low and a second peak at evening while plasma AVP was high. Changes in plasma cGMP correlated with variations in plasma ANF. feeding and/or plasma volume elevation probably accounted for both peaks in plasma ANF and the low mid-day level of plasma AVP, but the rise in plasma AVP at evening may represent a diurnal rhythm.
