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Photoperiodic control of antler cycles in deer. VI. Circannual rhythms on altered day lengths

โœ Scribed by Goss, Richard J.

Publisher
John Wiley and Sons
Year
1984
Tongue
English
Weight
834 KB
Volume
230
Category
Article
ISSN
0022-104X

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โœฆ Synopsis

Groups of sika deer were exposed to light and dark periods of equal lengths but different from 12 hr. Light cycles were 4.94L/4.94D, 6L/6D, 8L/8D, and 21Li21D. In all experiments, deer underwent circannual cycles of antler replacement, testis size, molting, and coat color. The results indicate that the previously reported abolition of circannual cycles on 12L/12D was due to the 12-hr duration of the light or dark periods, not their equivalence. They also eliminate the possibility that the circannual cycle might be the sum of 365 circadian cycles. Circannual antler cycles appear to be expressed under artificial light cycles to which the deer cannot entrain.

๐Ÿ“œ SIMILAR VOLUMES

Photoperiodic control of antler cycles i
Photoperiodic control of antler cycles in deer. IV. Effects of constant light:dark ratios on circannual rhythms
โœ Goss, Richard J. ๐Ÿ“‚ Article ๐Ÿ“… 1977 ๐Ÿ› John Wiley and Sons ๐ŸŒ English โš– 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

Photoperiodic control of antler cycles i
Photoperiodic control of antler cycles in deer. III. Decreasing versus increasing day lengths
โœ Goss, Richard J. ๐Ÿ“‚ Article ๐Ÿ“… 1976 ๐Ÿ› John Wiley and Sons ๐ŸŒ English โš– 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

Photoperiodic control of antler cycles i
Photoperiodic control of antler cycles in deer: VII. Role of light vs. dark in suppression of circannual rhythms
โœ Goss, Richard J. ๐Ÿ“‚ Article ๐Ÿ“… 1987 ๐Ÿ› John Wiley and Sons ๐ŸŒ English โš– 357 KB

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,