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International Journal of Biometeorology

, Volume 31, Issue 3, pp 237–247 | Cite as

Circadian rhythm of aldosterone in dairy cattle during the summer

  • T. J. Aranas
  • J. D. Roussel
  • S. H. Seybt
Article

Abstract

Twelve Holstein heifers, pregnant from 120–150 days were used to study the circadian rhythm of aldosterone, cortisol, progesterone, sodium and potassium in dairy cattle during the summer in Louisiana. Cortisol was not significantly influenced by time (time 1 = 06.00 h). Aldosterone, sodium, potassium and progesterone changed significantly (P<.01) with time. Aldosterone peaked (116.5±17.2 pg/ml) at 08.00 h and then generally declined to 16.00 h (26.7±2.0 pg/ml). Sodium generally increased from 06.00 h (320.1±7.3 mg%) to 18.00 h (377.9±6.1 mg%), and then declined. Potassium generally increased from 06.00 h (20.9±0.5 mg%) to 22.00 h (23.0±0.3 mg%). Progesterone generally increased from 07.00 h (2.8±0.4 mg/ml) to 24.00 h (7.5±1.4 mg/ml). Aldosterone was significantly related to temperature associated with the time of the day samples were taken (r = 0.66, P<.02).

Keywords

Sodium Potassium Cortisol Plant Physiology Progesterone 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Swets & Zeitlinger 1987

Authors and Affiliations

  • T. J. Aranas
  • J. D. Roussel
    • 1
  • S. H. Seybt
  1. 1.Department of Dairy ScienceLouisiana Agricultural Experiment StationBaton RougeUSA

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