"Good light gives us about half a litre extra milk per cow per day."

Inside the Sedlmair family barn there is natural light even on a late afternoon in winter. The amount of daylight plays an important role in how cows feel, and affects the amount of milk they produce.


Long periods of daylight have a very positive effect on milk yield, fertility and health of the animals. A cow needs about 16 hours of daylight to perform at its peak and research shows that the amount of milk increases by up to 15%*.

"We use lights from DeLaval between September and March. They shine about 12 hours a day in addition to daylight,” says Simon Sedlmair. “It is not only good for the cows, but also nice for us who work here."

"I estimate that the lights give us around half a litre extra milk per cow per day," says Mr. Sedlmair.

The illumination also has positive effects on young animals. More light increases their appetite and makes them grow faster. It allows the heifers to start their productivity cycle earlier.

Sedlmair barn

* Source: Dahl, G. E.; Petitclerc, D., 2003: Management of photo period in the dairy herd for
improved production and health, J. Anim. Sci. 81: 11-17.