[The effect of the light intensity under daylight and artificial light conditions in supply centers on the fertility of breeding sows].

The influence of light intensity in service areas on fertility of breeding sows under daylight as well as artificial light conditions has been confirmed. Under conditions of confinement, which are necessary for epidemic reasons too, the improvement of lighting is possible in two ways: 1. By increasing daylight coefficients to at least 1.0% (300 Lx at overcast sky) using natural light more efficiently (window: floor ratio greater than 1:20 and/or south direction of windows, S-S-E, resulting in higher light intensities) during sunshine. These measures require some investment, but do not add to running expenses. 2. By additional artificial lighting with current-saving light bulbs (fluorescent lightings) and their fitting next to animals, which should result in at least 300 Lx. The additional expenses seem to be acceptable versus improvement of sows fertility and better working conditions for staff.