Words no producer wants to hear: Cows at the neighboring dairy have bird flu virus

Mike Valadao
Valadao DairyHanford, California
5 Jun 2025 News 3 min

Mike Valadao of Valadao Dairy in Hanford, Calif., knew highly pathogenic avian influenza type A H5N1 (more commonly known as bird flu) was coming his way after hearing reports of neighboring dairies experiencing symptoms. He knew it was only a matter of time.

Valadao Dairy felt confident in his biosecurity measures and cow management protocols for their 2,200-cow dairy, however he also knew that stopping the spread of bird flu to his herd was going to be difficult.

Valadao Dairy turned to their CowManager monitoring system for help. “Early detection of the virus is critical to minimizing its impact,” says Valadao. “CowManager’s ear sensor measures ear temperature combined with eating, rumination and activity, providing us early and accurate health alerts.”

That gut-wrenching moment

The team watched the CowManager “potential sick cow” list go from 30 to 60 to 120 within hours. That’s when they knew the virus had hit them.

“With CowManager, we were able to catch infected cows two to three days before they showed clinical signs, allowing our team to intervene and begin treatment immediately,” says Valadao. “We watched the list on an hourly basis and knew which cows were off. The app showed signs that a cow may not be feeling well. We knew something was up.”

The Valadao team was on high alert, looking for cows not eating, cows being lethargic. CowManager caught these cows before the team did. “Because of CowManager, we knew a cow was infected before she actually showed signs and before we got a positive test,” adds Valadao.

Ear temperature as a key parameter

“CowManager’s ear sensors measure the temperature of a cow’s ear, which is a unique, valuable indicator of managing herd health,” says Valadao’s breeder and herd consultant, Mike Parreria. “The change in ear temperature along with changes in behavior mean a cow, in no uncertain terms, is getting sick.”

Parreria works with other herds in California. He says herds using CowManager have bounced back from bird flu much quicker than herds without the cow monitoring system.

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“On dairies without CowManager, I’m seeing an average turnaround time of 60 days to rebound from bird flu,” says Parreria. “At Valadao, they saw a 45-day recovery period. Milk production, which had dropped by 20 pounds per cow per day on average, returned to normal and there were fewer complications from other health challenges that many neighboring producers have seen amplified by bird flu. Having CowManager has also benefited the Valadao repro program post-infection, as Mike’s cows have had less reproductive challenges compared to other herds I’m breeding.”

“CowManager definitely helped reduce losses associated with the bird flu,” reports Valadao. “It started on day 1 because the team had an accurate list of cows that needed attention. I was actually able to see those cows get better via the CowManager app; I watched their data improve shortly after we treated them. Early detection was a key component to our cows bouncing back.”

Valadao Dairy is Beyond Happy with CowManager

Valadao began looking for a cow monitoring system more than a year ago. He wanted to reduce lockup times and improve cow welfare. With the help of Parreria and Brandon Thesing, Director of Corporate Accounts at Select Sires Member Cooperative, Valadao turned to CowManager. “Not only has it helped us through the bird flu and reduced lockup times, but it’s also improved our herd health and heat detection. The Health and Fertility modules have been a big blessing,” says Valadao. “Plus, it’s super user friendly and it has boosted morale. My team loves showing up to the dairy with a plan. There is no more guessing as to which cows to breed or which cows to treat, and it makes their day easier.”

Parreria concurs. “CowManager has been a game changer for Valadao Dairy. Cows don’t spend as much time in lockups, and they are seeing more milk, better cow welfare and higher conception rates.”

Why CowManager?

Monitor Your Herd’s Health 24/7

Our Health Module provides early disease detection! CowManager cows live longer, produce more milk, are in better shape and therefore perform better.

Catch Diseases Early, Reduce Sick Cows

Get alerted immediately when a cow isn't ruminating or eating, and intervene proactively. Pick up on diseases like mastitis and ketosis in an early stage.

Improve Health & Production

Optimize your farm management by finding cows in heat and catching sick cows earlier, improving your herd’s health and production.

Modules & Extra Functionalities

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Health

Get an alert up to 3 days before any signs of clinical illness. Or, if your cow is already sick, monitor recovery in detail.

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Fertility

Increase profit with timely insemination. Know exactly when a cow is in heat and when to inseminate.

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Nutrition

Prevent heat stress and disease, take your feed management to the next level, and achieve the goals set for your herd.

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Transition

Experience smoother transitions and healthier herds with our advanced Transition Monitor.

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Youngstock

Effective calf health management leads to increased future milk production and a healthier, more productive herd.

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Auto Drafting

Separate cows with heat or health alerts from the rest of the herd with the integrated Auto Drafting functionality.

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MultiView

Give your staff, veterinarian, nutritionist, and other advisors access to selected cow data.

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Sort my Cow (USA)

Automatically separate cows with heat or health alerts with Sort my Cow and the CowManager sorting gate.

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Draft my Cow (NZ)

Automatically separate cows with heat or health alerts with Draft my Cow and the CowManager drafting gate.

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Find my Cow

Find a cow that’s in heat, sick or in the wrong pen within seconds with our Locator and Flash tools.

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