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Journal of Nutrition Vol. 111 No. 11 November 1981, pp. 2006-2014
Copyright © 1981 by American Society for Nutrition
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Plasma Parathyroid Hormone and Insulin Concentrations in Cows Administered Potassium Chloride and Sodium Citrate1,2,

Lawrence E. Deetz, Ray E. Tucker3 and George E. Mitchell, Jr.

Department of Animal Sciences, University of Kentucky, Lexington, KY 40546

Two age groups of nonpregnant cows were used to study plasma changes in parathyroid hormone, insulin, and glucose, and renal clearance rates of magnesium, calcium, and inorganic phosphorus after intraruminal administration of 1.5 g potassium chloride (KCl)/kg body weight (BW) or 1.5 g sodium citrate/kg BW. Magnesium (2.4 mg/kg BW) was simultaneously infused intravenously for 120 minutes to facilitate the measurement of changes in magnesium clearance rate and kidney tubular resorption due to the treatments. Elevated plasma concentrations of potassium from intraruminal infusion of KCl increased plasma parathyroid hormone, insulin, glucose, and magnesium levels. Net tubular resorption of magnesium (TMg) was also increased after potassium dosing, and the old cows had lower TMg values compared with the young cows. Plasma magnesium and calcium clearance rates were increased only by citrate, while phosphorus was not influenced by either treatment. These results provide evidence for a relationship between potassium and the endocrine factors, parathyroid hormone, and insulin; citrate appears to antagonize tubular resorption of magnesium and calcium.

KEY WORDS: • parathyroid hormone • insulin • potassium • glucose • cows • renal clearance

1 Published as part of the Kentucky Agricultural Experiment Station journal series, paper 81-5-56.

2 Part of the work reported in this paper was presented at the 73rd annual meeting of the American Society of Animal Science, Raleigh, NC, 26–29 July, 1981 and was supported in part by USDA/SEA-CR grant 901-15-161.

3 To whom reprint requests should be sent.

Manuscript received 7 April 1981.




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