Influence of photoperiod on the time of parturition in the rat. III. Comparison of different daily light lengths with changes in light timing or light pulse given during darkness.
D000818:Animals; D005260:Female; D005865:Gestational Age; D007743:Labor, Obstetric / Q000528:radiation effects*; D008027:Light; D010507:Periodicity; D011247:Pregnancy; D011270:Pregnancy, Animal / Q000528:radiation effects*; D051381:Rats