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OmniGen AF

OmniGen AF is a unique and patented blend of distinct ingredients for cows.
Approved for organic use in the Netherlands.
Feeding OmniGen AF on a daily basis helps to support the immune system, especially during expected and unexpected stress events.
OmniGen AF is a research proven product (250+ research publications and 95+ peer review articles) with effective field tests on more than 1,000 farms and over 650,000 dairy cows.
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Get an immunity assessment Get an immunity assessment

Winner Golden Innovation Awards

European heat stress patent

OmniGen AF
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productivity and profitability challenges

You Face Challenges Every Day

Running a profitable dairy operation means overcoming constant challenges—from maintaining udder health and optimising reproduction to managing heat stress. While there is no single solution, research-backed nutritional support can help you tackle these issues head-on and protect your investment in every cow.  

Discover how we can help with:

Mastitis

Udder Health

 
Optimal udder health is a cornerstone of sustainable and profitable dairy production. A well‑functioning udder supports high milk yield, consistent milk quality, and the overall comfort and longevity of the cow. Conversely, udder health challenges represent one of the most costly issues in modern herds, affecting milk output and quality, culling rates, veterinary interventions, and labour demands. Beyond direct treatment costs, losses also arise from discarded milk, poorer reproduction, and shorter productive lifespans.
 
OmniGen AF® helps improve udder health by supporting immune defence in dairy cows. Several studies have demonstrated the positive effects OmniGen AF® can have on herd udder health, such as lower somatic cell counts1, decreasing the chances of infection spreading throughout the herd—protecting both udder health and your operation's profitability.
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Request OmniGen AF

OmniGen AF helps to support the immune capability of dairy cows for optimised health and production.

Get the product Request OmniGen
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OmniGen AF Results

Discover the effects on cow health and performance in 244 European dairies before and during feeding OmniGen AF.

View the results
Heat stress

Heat Stress

 
Heat stress costs European dairy farms an average of €270 per cow annually2. High temperatures weaken immune defence3, reduce appetite, and increase respiration rates4—all negatively impacting productivity. By combining traditional cooling measures with OmniGen AF® nutritional support, you can help maintain dry matter intake and production during heat stress periods5, while improving animal welfare and supporting reproductive performance6.  
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Chiel welkom

“It is crucial to feed OmniGen AF throughout the entire dry period in order to achieve the desired results.”

 

Chiel Kraesgenberg, Key Account Manager, Phibro

Days open

Open days

 
Each day a cow remains open costs between €2-57, and health incidents can interfere with reproduction for over 4 months8. When cows divert energy towards immune defence against external challenges rather than for productivity, conception becomes less likely due to inflammatory responses and impaired uterine environment8. OmniGen AF® helps by supporting immune response during critical reproductive periods. This can lead to better embryo quality9 and 10 fewer days open10— optimising your operation's reproductive efficiency and profitability.  
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See OmniGen AF in Action

 

 

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FAQ OmniGen AF

What is OmniGen AF?

OmniGen AF is a unique, patented and scientifically proven nutritional speciality product that, when fed on a daily basis, helps dry cows, freshly calved and lactating dairy cows to maintain a properly functioning immune system, especially under stress conditions. More than 2 million dairy cows around the world are currently using OmniGen AF. And this number is increasing daily.

How does OmniGen AF work?

OmniGen AF supports the response of the immune system during stress. Which can lead to fewer health events and a better productivity.

What positive effects can I expect to see in cow health when feeding OmniGen AF?

Over 80 scientific publication and field trials carried out on more than 700,000 dairy cows in Europe and the USA have shown that OmniGen AF can reduce the incidence of disease, cut down on antibiotic usage, reduce culling rates and improve milk yield and quality.

How should I use OmniGen AF? What is the recommended feeding rate?

OmniGen AF should be fed to dry and lactating cows at the rate of 55 grams per head per day. OmniGen AF should be introduced to the ration 45 to 60 days prior to calving and continued to be used throughout the entire dry period.

View all frequently asked questions (FAQs) for OmniGen AF
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Get an immunity assessment for your herd

If you’d like to find out more about how we could help you to optimise your herd’s performance, please submit your telephone number to request a callback. We’ll call you within three working days to set a date for a telephone or face-to-face meeting to discuss the following:

1

Current situation analysis

We’ll work with you to understand your herd’s current status and to identify areas for improvement.

2

Designing a plan of action

We’ll recommend where improvements can be made and how our products can unlock your herd’s full potential.

3

Evaluation

We’ll carry out a detailed review to make sure the changes we’ve put in place are working effectively and, where necessary, provide additional support and advice to enable your herd to continue to improve.

Arrange your immunity assessment Get an immunity assessment

References:

  1. Nickerson et al., 2013. PAHC Reference #OG010413.
  2. Feenstra, 2017. http://edepot.wur.nl/413099. Accessed Mar. 16, 2026.
  3. Nickerson, S. 2014. UGA Extension Bulletin 1426.
  4. Hall et al., 2018. J. Dairy Sci. 101:7095-7105.
  5. Hall, L. W. et al., 2014. PAHC Reference OG020414.
  6. Fabris, T. F. et al., 2016. PAHC Reference OG010916
  7. Dairy Cattle Reproduction Council, 2017.
  8. Ribeiro et al., 2016; J. Dairy Sci. 99:2201–2220; doi:10.3168/jds.2015-10053.
  9. Snider et al., 2019. Anim. Reprod. Sci. 210:1-9.
  10. Casarotto et al., 2020. Anim. Feed. Sci. Technol. 267:1-9.