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Photoperiodic control of antler cycles in deer. V. Reversed seasons

✍ Scribed by Goss, Richard J.

Publisher: John Wiley and Sons
Year: 1980
Tongue: English
Weight: 396 KB
Volume: 211
Category: Article
ISSN: 0022-104X
DOI: 10.1002/jez.1402110111

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✦ Synopsis

Abstract

Newborn and weanling fawns were held under reversed annual light cycles to learn if the subsequent replacement of their antlers would coincide with the anniversary of their births, as occurs in nature, or adapt to the artificial seasons of increasing day lengths even when these fall at the “wrong” time of year. The first sets of antlers developed at approximately the normal age when the deer were yearlings. These antlers, however, were shed and replaced half a year earlier than would otherwise haveoccurred under natural environmental conditions. It is concluded that the onset of renewed antler growth is not a response to every other time the photoperiod increases or decreases, but is triggered by lengthening days, irrespective of the age of the deer.

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## Abstract Deer were exposed for three years to photoperiods which increased or decreased two hours every four months, starting at 4L/20D or 20L/4D, respectively. Under both sets of conditions, antlers were repeatedly shed and replaced, usually in synchrony with every other time the day lengths we

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## Abstract Yearling sika deer, when exposed to constant unequal photoperiods since the autumnal equinox, replace their antlers the next spring and at irregular intervals thereafter. On equatorial light cycles (12L: 12D) they retain their original antlers indefinitely. The changeover occurs between

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The antler replacement cycle in the sika deer (Ceruus nippon) is abolished on simulated equatorial photoperiods (12L/12D), the old antlers failing to be regenerated for indefinite durations. Constant but unequal light and dark periods have been shown to permit expression of circannual rhythms,