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Circadian rhythm in wool depilation force in Merino and Merino X Border Leicester sheep

Published online by Cambridge University Press:  27 March 2009

A. Foldes ,
J. B. Donnelly ,
C. A. Maxwell ,
S. B. James  and
S. L. Clancy
A. Foldes
Affiliation:
Divisions of Animal Production
J. B. Donnelly
Affiliation:
Mathematics and Statistics, CSIRO, P. O. Box 239, Blacktown, N. S. W. 2148, Australia
C. A. Maxwell
Affiliation:
Divisions of Animal Production
S. B. James
Affiliation:
Divisions of Animal Production
S. L. Clancy
Affiliation:
Mathematics and Statistics, CSIRO, P. O. Box 239, Blacktown, N. S. W. 2148, Australia
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Summary

As part of an ongoing investigation of ovine neuroendocrine mechanisms relating to photoperiod and eventually to wool growth, the diurnal variation of depilation force (an index of the strength of attachment of wool fibres to the skin of sheep) was investigated in Merino wethers and Border Leicester Merino ewes. Circadian rhythms were demonstrated in depilation force in both ewes and wethers. Further experiments were performed to investigate circadian endocrine rhythms which may have some bearing on the observed rhythm in depilation force. Circadian rhythms 180° out of phase with the depilation force rhythm were observed in plasma cortisol concentrations and in pineal serotonin N-acetyltransferase activities in Merino wethers.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 104 , Issue 2 , April 1985 , pp. 397 - 403
Copyright
Copyright © Cambridge University Press 1985

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