09/03/2026
With Labor Day just around the corner, it’s hard not to notice the shorter days and cooler nights. Dairy cows notice these things too. Did you know cows are photosensitive? They produce more milk during times of longer sunlight. Today’s dairy farmers don’t just milk their cows in the spring, summer, and fall like they did a couple of centuries ago.
In the past, cows calved in the spring and produced milk for the next 8 to 9 months. Today, dairy farms produce milk year-round and the lighting in their barns is just one of the tools farmers implement to help make that happen.
Image courtesy of Dairy Farmers of Wisconsin.