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Photoperiodic control of antler cycles in deer: VII. Role of light vs. dark in suppression of circannual rhythms

✍ Scribed by Goss, Richard J.

Publisher: John Wiley and Sons
Year: 1987
Tongue: English
Weight: 357 KB
Volume: 244
Category: Article
ISSN: 0022-104X
DOI: 10.1002/jez.1402440113

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✦ Synopsis

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,

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Photoperiodic control of antler cycles i

Photoperiodic control of antler cycles in deer. IV. Effects of constant light:dark ratios on circannual rhythms

✍ Goss, Richard J. 📂 Article 📅 1977 🏛 John Wiley and Sons 🌐 English ⚖ 425 KB

## 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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## 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

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✍ Goss, Richard J. 📂 Article 📅 1976 🏛 John Wiley and Sons 🌐 English ⚖ 462 KB

## 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