## 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
Photoperiodic control of antler cycles in deer. II. Alterations in amplitude
โ Scribed by Goss, Richard J.
- Publisher
- John Wiley and Sons
- Year
- 1969
- Tongue
- English
- Weight
- 944 KB
- Volume
- 171
- Category
- Article
- ISSN
- 0022-104X
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๐ SIMILAR VOLUMES
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
## 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
## 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
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,