Website helps California poultry producers monitor avian flu risk

New California Waterfowl Tracker website launched to help poultry producers assess avian flu risk.

February 23, 2018

3 Min Read
Website helps California poultry producers monitor avian flu risk
Migrating waterfowl stop at Yolo Bypass in California. UC-Davis research has shown that 5-20% of waterfowl carry avian influenza.University of California

To reduce potential exposure to avian influenza, a new interactive website is now available to help California poultry producers, backyard poultry enthusiasts, regulators and risk managers assess the locations of waterfowl relative to poultry farms in the Central Valley, according to the University of California (UC) Division of Agriculture & Natural Resources.

While not all waterfowl carry avian influenza, the migratory birds are the primary reservoir of the virus that kills chickens, turkeys and other birds and can take an economic toll on the poultry industry. During an outbreak of a highly pathogenic strain of avian influenza in 2014-15, nearly 50 million birds were lost in the effort to contain the disease in the U.S., UC explained.

“Avian influenza is such a devastating disease. In an abundance of caution, we want to limit any interaction between waterfowl and domestic poultry,” said UC Cooperative Extension poultry specialist Maurice Pitesky, who is with the School of Veterinary Medicine at UC-Davis.

The California Waterfowl Tracker has been developed by Pitesky, the University of Delaware, the U.S. Geological Survey and UC Agriculture & Natural Resources to show where waterfowl are.

From September through March, geese, ducks and other waterfowl migrate by the millions via the Pacific Flyway and winter in California's wetlands and rice and corn fields. At the height of migration, the Central Valley is home to 3 million waterfowl.

The Central Valley is also home to the majority of the state's commercial egg-laying hens, broiler chickens and turkey flocks.

Using a web app to understand when and where waterfowl are feeding and roosting, poultry farm managers and other stakeholders will be able to consider waterfowl in their decision-making. They may decide to place pasture-raised poultry in a region of the state that has fewer wetlands. If a large number of Canada geese take up residence nearby, poultry owners may decide to move their domestic birds indoors to reduce exposure until the migrating waterfowl move on.

Using a machine-learning approach developed by Jeff Buler, University of Delaware wildlife ecology professor, the web app produces a waterfowl density map of California's Central Valley that is automatically updated daily with both satellite and weather station information.

“The model doesn't tell us whether waterfowl are carrying avian influenza, but it helps poultry producers and regulators understand where those interfaces could happen,” Pitesky said.

Additional waterfowl habitat and next-generation radar analysis of waterfowl are integrated into the web app. Users can search one or more addresses to anticipate their farms' interaction with waterfowl. Based on the proximity of waterfowl and wild bird monitoring information from the U.S. Fish & Wildlife Service, poultry owners can make biosecurity decisions.

“While the current version of the website is designed for California, the long-term goal is to develop and expand this system for the continental U.S. to promote health and safety of poultry flocks nationally,” Pitesky said.

To use the California Waterfowl Tracker, visit the UC Cooperative Extension Poultry website at A video of Pitesky demonstrating how to use the web app can be viewed at

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