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Effect of Photoperiod on Milk Yield and Milk Fat in Commercial Dairy Herds¹

Department of Animal Science, Michigan State University, East Lansing 48824

ABSTRACT

Two hundred and sixteen cows stanchioned in 13 dairy herds were exposed to supplemental lighting of 16 to 16.25 h of light per day from fluorescent lamps, whereas 240 herdmates received only sunlight (9 to 12 h/day) plus lighting for usual management activities (e.g., milking and feeding). After adjustment for differences in stage of lactation, lactation number, mature equivalent, and pretrial milk yield, cows exposed to supplemental lighting produced 2.2 kg per day more milk and had .16% less milk fat than herdmate controls.

¹ Michigan Agricultural Experiment Station Journal Article No. 11019. This research was supported in part by USDA Grants 901-15-2 and 59-2261-0-2-072-0.

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