Administrative Report Or Publication
 

Managing light in dairy barns for increased milk production

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  • Milk production can be increased by managing dairy cows’ exposure to light. Photo period is defined as the duration of light exposure within a 24-hour period. A long-day photo period (LDPP) means exposure to 16–18 hours of continuous light followed by 6–8 hours of continuous darkness. A short-day photoperiod (SDPP) is defined as continuous exposure to 8 hours of light followed by a continuous 16-hour period of darkness. In practice, SDPP is anything less than 12–13 hours of light. Lactating cows exposed to LDPP consistently show an 8–10 percent increase in milk production (on average, 5 lb milk/cow/day) regardless of their original production level. The LDPP should begin immediately after calving, and the increased milk production becomes fully apparent 3–4 weeks later.
  • Published September 2001. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog
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