The influence of light on dairy cow productivity
![More light improves productivity of dairy cows More light improves productivity of dairy cows]()
Proper lighting in the barn ensures optimal cow productivity, i.e. milk yield. It has been proven that proper illumination in the barn (100-200 lux are needed) can result in a 6 to 10 % increase in milk production.
(source: http://www.lely.com/en/housing/lighting-system_2/light-for-cows)
Summary of the results of diverse studies on the effect of lighting intensity on the productivity of dairy cows:
- A long day photoperiod (16 hours/day) results in increased milk yield, especially when no short day photoperiod is feasible in the dry phase.
- Heifers should be exposed to a long day photoperiod (16 hours /day) from weaning to puberty, because that supports the development of mammary parenchyma.
- During the last 60 days of pregnancy, heifers and dry cows should be exposed to a short day photoperiod (8 hours/day), because that maximizes milk production in the subsequent lactation and strengthens the immune system during the transition.
- According to bibliographical references, the effect of a long day photoperiod starts after 3 to 4 weeks on the average.
Overview of 10 studies on the effect of the photo period on milk yield:
![effect of light on dairy cow milk yield: research studies show positive influence of the long day photoperiod effect of light on dairy cow milk yield: research studies show positive influence of the long day photoperiod]()
Obvious positive influence of the long day photoperiod on milk yield!
Source: G. E. Dahl and D. Petitclerc, 2003: Management of photoperiod in the dairy herd for improved production and health. J Anim Sci. 81:11-17
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