Indeed, under artificial conditions, short days stimulate
ovarian activity, while long days inhibit it (Duarte et al.,
2010). However, when non-lactating females are continuously
exposed to artificial long days, ovulatory or endocrine
activities start between 150 and 200 days after the onset
of the long-day signal (Maeda et al., 1988). This phenomenon
occurs because the animals became insensitive
to the continuous perception of short or long photoperiods