Understanding HPAI Transmission Risk on Dairy Farms

Oct 20, 2025

Beginning in early 2024, Highly Pathogenic Avian Influenza (HPAI) has been detected in U.S. dairy herds, threatening milk production. Yet little is known about how the virus spreads in cows. The Foundation for Food & Agriculture Research (FFAR) and Michigan State University (MSU) are investing $225,201 into a Rapid Outcomes from Agricultural Research (ROAR) grant to understand how HPAI is transmitted in dairy cows.

Infected dairy cows experience sudden drops in milk production, lowering milk quality and causing significant economic losses for farmers. Cases of HPAI have also been observed spilling over from cattle to dairy workers. The level of risk for dairy workers from this novel spillover transmission poses and how it occurs is still under study.

Researchers led by Dr. Catalina Picasso, MSU assistant professor of large animal clinical sciences at the College of Veterinary Medicine, are detecting and quantifying the risk of environmental HPAI transmission for animals and humans by mapping results from animals and air samples collected at dairy farms experiencing cases of avian influenza.

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Video: FLEECED! Sheep Shearer Hands Over Clippers!

It's sheep shearing day at Ewetopia Farms! ?? Our Dorset lambs and ewes are getting fleeced — and for the first time, our shearer hands over his clippers to a beginner. We finish shearing the last of our adult ewes and this year’s Dorset ewe lambs.

From moving the sheep between barns, loading them into chutes, and watching the wool come off, this is always one of the most satisfying days on the farm. But this video has a twist — we welcomed a new helper, Gian, who’s not only lending a hand but also learning how to shear! With guidance from our experienced shearer, he got a crash course in sheep shearing and even tried his hand at shearing a couple of lambs himself.

You’ll see firsthand how both teacher and student handled this unique challenge. Shearing is more than just removing wool — it’s about sheep health, comfort, and giving us a closer look at the flock. It’s always amazing to see the transformation from woolly sheep to freshly shorn ewes and lambs.