The Rural Voice, 2002-05, Page 20HYDRAULIC
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require 22 fixtures.
"One specific management
challenge is to provide six
uninterrupted hours of darkness for
cows milked three times per day.
Extending the installation of and
management of the lighting system,
with appropriate `light' and `dark'
intensities, to the holding pen may be
required. Light intensity must be
evenly distributed throughout each
barn, avoiding `spot -lighting' and
dark corners. Appropriate height of
light fixtures can help achieve
uniform distribution.
common mistake is to place
lights only above the
feedbunk and not evenly
throughout the entire freestall barn.
Consider a cow is at the feedbunk 3-
4 hours a day and resting in a
freestall 9-14 hours per day. If the
lighting is inadequate in the freestall,
where the cow spends a majority of
her time, the cow will not be exposed
to the required photoperiod.
"Increased milk production will
cause a subsequent increase in dry
matter intake. The increase in DMI
will be approximately one kilogram
per cow per day, depending on the
milk response. The increase in feed
"Increased milk
production will cause a
subsequent increase in
dry matter intake."
costs will be significantly smaller
than the increase in revenue from
milk.
"Using photoperiod management
to increase milk production is
profitable. To calculate expected
annual profit for a specific operation,
use the calculation worksheet on the
website reference at the conclusion
of this bulletin. Generally a
completely new lighting system will
pay for itself within six months to
one year of installation, depending
largely on labour cost for installation.
"Additional source of
information:
"The website http://iltraill,
outreach.uiuc.edu/photoperiod has
additional information on
photoperiod, worksheets to assist
producers in light design and cost
analysis, and other contact
information."0