各系マウスの発情周期に及ぼす連続照明および連続暗黒の効果

概要

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Effects of various lighting environments on estrous cycles were examined in mice of ICR-JCL, AA. IVCS, RR, C3H/He and C57BL/6N strains. Each strain was divided into 3 groups consisting of 7-10 animals: cyclic illumination (LD); continuous illumination (LL); and continuous darkness (DD). All groups were exposed to the respective lighting environment for 100 days (31 to 130 days of age). Only the IVCS strain maintained a regular 4-day cycle in the environment of LD, while cycles of all other strains remained irregular for all the experimental periods. LL induced persistent estrus in some animals of ICR-JCL, IVCS, RR and C57BL/6N strains of mice. Most other mice of the strains, however, did not show persistent estrus, though they showed varying changes in each cycle. AA strain, especially, had a remarkable pseudopregnant diestrous phase in LL. DD environment, on the contrary, had no effect on the estrous cycles except for some prolongation of the estrous phase. Generally, mice in DD seemed to respond to this environment by two-days estrus. It is difficult to draw a conclusion on the influence of light on the estrous cycles of mice because of considerably large differences among strains in their responses.
社団法人日本動物学会の論文
1977-06-25