Increased photoperiod

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Increased photoperiod
expose lactating cows to 16 hr of light 8 hr of
darkness increases milk yield by 5.0
lb/cow/day
requires 15 foot-candles measured 3 above stall
surface usually metal halide or high pressure
sodium lamps placed 12 16 above floor
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Increased photoperiod
low intensity red lights (7.5 W bulbs _at_ 20-30
intervals) used for observation and movement of
cows dry cows respond to 8 hr light 16 hr
darkness ( 7.0 lb milk/d in subsequent
lactation)
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