Circadian changes in electrolyte concentrations in plasma and erythrocytes in two-week-old calves
1997
Skotnicka, E. | Skrzypczak, W.F. | Ozgo, M. (University of Agriculture, Szczecin (Poland). Dept. of Animal Physiology)
The aim of this study was to determine changes in the content of Na, K, Cl, Ca, Mg and P in the plasma and erythrocytes of 14-day-old calves with simultaneously performed evaluation of the occurrence and analysis of the rhythms. Blood samples were collected seven times over a period of 24 hours, spaced by 4 hour intervals. In the whole blood, hematocrit and concentrations of Na, K, Cl, Ca, Mg and P were determined. The plasma osmolality was also determined. The concentrations of sodium, potassium and chlorides in the erythrocytes were estimated using an indirect method. The circadian variations in plasma concentrations of sodium, potassium and chlorides and in its osmolality were found in two-week-old female calves. Changes in plasma content of sodium and potassium within twenty-four hours were significant (P0.01). On the other hand, calcium, magnesium and phosphorus concentrations in plasma and concentrations of sodium, potassium and chlorides in erythrocytes were stable over the twenty-four hour period under study.
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