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Control of the annual rhythm of breeding in ewes: effect of an equatorial daylength with reversed thermal seasons

Published online by Cambridge University Press:  27 March 2009

M. Wodzicka-Tomaszewska ,
J. C. D. Hutchinson  and
J. W. Bennett
M. Wodzicka-Tomaszewska
Affiliation:
C.S.I.R.O. Division of Animal Physiology, Ian Clunies Ross Animal Research Laboratory, Prospect, N.S.W., Australia, and Ruakura Agricultural Research Centre, Hamilton, New Zealand
J. C. D. Hutchinson
Affiliation:
C.S.I.R.O. Division of Animal Physiology, Ian Clunies Ross Animal Research Laboratory, Prospect, N.S.W., Australia, and Ruakura Agricultural Research Centre, Hamilton, New Zealand
J. W. Bennett
Affiliation:
C.S.I.R.O. Division of Animal Physiology, Ian Clunies Ross Animal Research Laboratory, Prospect, N.S.W., Australia, and Ruakura Agricultural Research Centre, Hamilton, New Zealand
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Extract

1. Three groups of seven Southdown and seven medium wool Peppin Merino ewes were subjected, respectively, to seasons of daylength corresponding to a latitude of 60° S., reversed seasonal lighting (60° N.) and an equatorial daylength with reversed thermal seasons, for 2½ years. During the next 20 months group 1 continued as before. Group 2 had a 32-week photoperiodic year and group 3 had a 32-week thermal year with equatorial daylength.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 68 , Issue 1 , February 1967 , pp. 61 - 67
Copyright
Copyright © Cambridge University Press 1967

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References

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