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Elevated Plasma Cortisol during Induced and Spontaneous Hypocalcemia in Ruminants¹

Department of Dairy Science, University of Wisconsin, Madison 53706

ABSTRACT

The relationship of Cortisol in blood plasma with plasma calcium and phosphorus was studied from 3 days before to 2.5 days after calving in 12 dairy cows (third or more parity). Cows were in three groups: 1) paretic (displayed hypocal-cemic and lateral recumbency), 2) non-paretic (plasma calcium at least 8.0 mg/100 ml), and 3) borderline (plasma calcium less than 8.0 mg/100 ml). Cortisol concentrations from 0 to 1.5 days postpartum reflected the state of calcium stress of the groups, paretic more than borderline and borderline more than nonparetic. Phosphorus was lower from 0 to 1 day postpartum in paretic cows. Calcium and phosphorus were negatively correlated (within cow) with Cortisol (–.53,–.37).

In experiments with goats, Cortisol was released in response to hypocalcemia and displayed no activity in initiating an onset of hypocalcemia when given exogenously. Also, the observation that cortisol-treated goats responded less severely with calcium depression and recovered faster from induced hypocalcemia by ethylene gly-col-bis (ß-amino-ethyl ester) N,N'-tetraacetic acid infusions suggests Cortisol may aid the animal in recovering from hypocalcemia.

¹ Research supported by the college of Agricultural and Life Sciences, University of Wisconsin, Madison, and by Hatch Project 5051.

² National Animal Disease Center, USDA, SEA, P. O. Box 70, Ames, IA 50010.

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