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Journal of Dairy Science Vol. 58 No. 1 30-33
© 1975 by American Dairy Science Association ®
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Diurnal Variations in Blood Cortisol in the Dairy Cow

Susan Hudson, M. Mullord, W. G. Whittlestone and E. Payne

Ruakura Animal Research Centre1, Private Bag, Hamilton, New Zealand

ABSTRACT

Concentrations of adrenal corticosteroids in plasma were determined by a competitive protein-binding technique in blood samples taken hourly over 24 h from four dairy cows, each sampled for three 24 h periods. Mean blood Cortisol was 7.9 ng/ml. Statistical analysis revealed no diurnal variation. Reasons for this are postulated.

FOOTNOTES

1 Ministry of Agriculture and Fisheries, Ruakura Agricultural Research Centre, Hamilton, New Zealand.






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Copyright © 1975 by the American Dairy Science Association ®.