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Research Project Information

Research Project Summary Information

Long-day Energy Efficient lighting for dairy operations(26519)

Cornell Coop Ext Livingston County


Utilizing long-day (sixteen (16)-hour) photoperiod (LDPP) to improve milk production efficiency may increase the profitability and competitiveness of the dairy industry in New York State. There is some evidence to suggest that exposure of dairy cows to long-day (sixteen to eighteen hours) lighting leads to 5% to 16% increase in milk production (as much as five pounds more milk per day, per cow) without affecting milk composition, increasing overall fat and protein yield. The long photoperiod is thought to stimulate concentrations of prolactin and growth factors associated with improved mammary growth and function in cows, without adversely affecting cow health.

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Project Description

The objective of this study is to quantify the relationship between long-day (16-hour) lighting and milk production in dairy cows, and determine which lighting systems (T8 fluorescent (T8), or light-emitting diode (LED)) provide maximum milk production and quality while maximizing energy efficiency.


The results are expected to inform dairy operators of the most energy efficient and effective lighting for improving milk yield and quality.

Project Results


Cornell Coop Ext Livingston County
3 Murray Hill Dr.
Mt. Morris, NY 14510

Principle Investigator

Libby Gaige

Universities Involved

Rensselaer Polytechnic Institute
Cornell University


Project Type:

Research Study

Technologies Types:

Building Systems

NYSERDA Contact Information

Sandra Meier


R&D - Environment & Energy Res

Contract Details

Start Date: 3/15/2012
Project Status: Active
Contract Number: 26519

Last Updated: 2/11/2014