Absence of diurnal rhythm of plasma cortisol in Bos indicus (Boran) cattle

Getachew Abebe, Jim Scott, Robert Eley


Plasma cortisol concentrations were determined by radioimmunoassay in blood samples which were taken at hourly intervals over 24 h from eight Bos indicus (Boran) cattle via indwelling jugular cannulae. Statistical analysis revealed no diurnal variation of cortisol in Boran cattle. Possible explanations for this are cited in the discussion.


Plasma cortisol; Diurnal rhythm; Boran cattle

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