ZeroFly® Screen

ZeroFly® Screen is the first insecticide-incorporated screen that keeps livestock healthy and productive by reducing the impact of nuisance and biting flies, for example tsetse flies which are the vector of trypanosomiasis (Sleeping Sickness or nagana). It contributes to UN Millennium Development Goal (MDG) 1: Eradication of Extreme Poverty and Hunger and MDG 7: Environmental Sustainability.

ZeroFly® Screen is reliable and provides consistent, long-lasting control. UV protection is incorporated to extend durablity, and the insecticide used is the FAO and WHO-approved deltamethrin. The need for repeat intervention is reduced because the insecticide is continuously refreshed at the surface of the yarns.

  • IMG 0089The United Nations Food and Agriculture Organization estimates that nearly 98 percent of the 870 million hungry people live in developing countries1. There, smallholder farmers produce most of the food consumed by their families and their communities and livestock is one of the farmers' most valuable assets. In addition to food output, livestock are used for draught power, transportation, fertilizer and fuel.

    ZeroFly® Screen is an important tool for farmers in developing countries. It helps keep livestock healthy and productive and protects communities from diseases spread from the animals infected by flies.

    ZeroFly® Screen also supports a multi-disciplinary One Health approach2, which aims to strengthen and improve the link between agriculture, improved nutritional outcomes and vector control. This approach recognizes that, in addition to tackling the issue of increasing food production, the decrease in serious disease burden will impact the percentage of the population who are able to work, along with the impact of disease on animal production.  In addition to decreasing poverty and hunger, the increase in self-sufficiency leads to reduced imports and, if scaled up, provides a significant boost to the local economy.



    1Food and Agricultural Organization of the United Nations. The State of Food Insecurity in the World 2014.  

    2One Health Initiative.

  • The Many Roles of Screen



     Importance of Keeping Livestock Healthy 

    • Farmers in developing countries are often small-scale, poor and have limited access to modern interventions that protect animal health. Livestock is one of the most valuable assets for these farmers. Livestock is the fastest growing nutritional source when compared to crops such as wheat and rice. But, farmers in developing countries often gain low yields from their livestock. In sub-Saharan Africa, the average milk cow produces four litres of milk; in the EU the average milk cow produces 40 litres of milk.
    • Maintaining healthy livestock is a major challenge. Existing tools demand repeat intervention. Biting flies can irritate farm animals enough to decrease their productivity and cause weight loss. Studies have shown that milk production can be decreased signficantly in cattle irritated by stable flies. Insects that bite and feed on livestock carry disease that can severely affect animal health and productivity.
    • Protecting livestock from biting files will result in higher yields for meat and maximize milk production, while minimizing the effects on farming habits1. Farmers will minimize time spent treating animals or seeking veterinary care for sick animals if they use an insecticidal intervention. Reseach has shown that animals in pens with insecticide-treated screen suffered from 77% fewer flies at 10 weeks. 80% fewer defensive movements made by animals in sheds lined with treated netting protects animal health and indicates less stress.



    1Economic Impact of stable flies (Diptera: Muscidae) on dairy and beef cattle production, by David Taylor, USDA, 2012.


  • ZeroFly® Screen is sufficient to kill most flies, though some species may survive up to 24 hours before they die.

    How It Works


    Studies show flies travel at low levels and will land on the fabric when approaching the animal shelters1.

    ZeroFly® SCREEN Features  


    • Works with a “zero grazing” or penned-in system which has proven to be highly effective in maintaining healthy, productive animals. In this system, livestock is kept in stalls, and feed and water are brought to the animals2,3


    • Controls disease causing biting flies such as tsetse flies that transmit trypanosomiasis and nuisance flies that can irritate and reduce productivity of livestock


    • Insecticide continuously refreshes itself on the surface of the yarns and incluldes UV protection to extend durability and effectiveness for several years, if properly maintained


    • Product is incorporated with deltamethrin, a safe and effective insecticide approved by the World Health Organization and the Food and Agricultural Organization

    Easy to Use

    • Screen can be cut to custom lengths and quickly installed on pens by a farmer using a hammer and nails
    • The material is easily kept clean using a soft broom or by washing occasionally with water to prevent build up of dust

     ZeroFly® Features Compared to Features of Other Fly Control Options

      ZeroFly® Pour-ons /dips Sprays Coils/ smoke
    Controls flies before they reach animals χ
    Single application, year-long effect, easy to apply χ χ χ
    No dose calculation based on animal weight χ
    No spills or drift χ χ χ
    No smell χ χ
    No pesticide residues in/on animals χ χ
    Cost effective, less than USD 0.01/day/animal χ χ χ



    1Torr, S.J., 1998. Behaviour of tsetse flies (Glossina) in host odour plumes in the field. Physiological Entomology. 13: 467-478.

    2Baltenweck, I., Mubiru, S., Nanyeenya, W., Njoroge, L., Halberg, N., Romney, D., and S. Staal, 2007. Dairy farming in Uganda: production efficiency and soil management strategies under different production systems. ILRI Research Report 1. Nairobi (Kenya): ILRI. 26 pp.

    3Mogaka, L.M., 1993. An economic evaluation of zero-grazing feeding system for high yielding cows on smallholder farms in Kenya. In: Proceedings of the Second African Feed Resources Network (AFRNET) Workshop held in Harare, Zimbabwe, 6-10 December 1993: Sustainable Feed Production and Utilisation for Smallholder Livestock Enterprises in Sub-Saharan Africa, Jean Ndikumana and Peter de Leeuw editors ZeroFly is sufficient to kill most flies, though some species may survive up to 24 hours before they die.



  • Map-with-cows-web


    pdficonSummary of Global Field Trials on ZeroFly Screen -download PDF 



    zerofly20014report  ZeroFly Evidence Summary 2014


    Demonstration of the successful use of the ZeroFly® Screen concept from FAO.:


    Key Findings:

    • Biting flies are highly susceptible to ZeroFly® Screen


    Field Study Validation

    Packed Cell Volume %


    Key Findings

    • General health of fenced cows, expressed as mean PCV %, was improved
    • Farmers also observed a decrease in flies and mosquitoes outside the pens and in their houses


    Field Study Validation

    Cattle Defense Against Flies



    Flies on Cattle


    Key Findings:

    • 77% fewer flies on animals at the 10-week point
    • 80% fewer defensive movements by animals in sheds lined with treated netting


    Validation of the Benefits of Zero Grazing

    Relationship Between Milk Productivity, Market Orientation and Cattle Farming System


    Key Findings:

    • In a study of smallholder dairy farming in Uganda, five dairy production systems were compared, from most intensive (zero-grazing) to least intensive (herding).
    • The study found that increasing the level of intensification resulted in an increase in milk productivity and % of milk sold.


    Average Economic Performance of Dairy Cows


    Evidence that Stable and Other Biting Flies Irritate Livestock

    Projected Economic Impact of Stable Flies on Livestock Production in U.S. (millions USD)


    The economic model is based on a U.S. average of 10 stable flies per animal for 3 months per year.

    Negative Impact of Stable Flies on Cattle Weight Gain


    Milk production can also be affected with 40-60% decreases (50+ flies/cow).


Recent News

  • Malaria No More honors Mikkel Vestergaard as one of ten innovators that will make possible the end of malaria in our lifetimes
  • US President’s Malaria Initiative visits Vestergaard-Noguchi Memorial Institute for Medical Research
  • Vestergaard joins Roll Back Malaria and Business Alliance against Malaria at World Health Assembly calling for the rapid uptake of innovative tools to eliminate malaria


Vestergaard S.A. primarily funds specific projects with specific outcomes. The grantee’s budget for each research agreement should reflect all of the expenses that are required for, and can be tracked directly to, the research project (i.e., direct costs). Vestergaard S.A. allows indirect costs up to 10 percent of the total project costs. For example, for project costs totaling $100,000 - up to $10,000 can be used for indirect costs and the remaining $90,000 can be applied toward project direct expenses. We understand that the indirect cost rates may not cover all of a grantee’s general operating costs, and grantees may need to use other resources to cover these costs.

Buy LifeStraw®

For consumer purchases, visit LifeStraw® to find a local retailer. For each consumer purchase, one school child in Africa will receive clean water for an entire school year. For large quantities purchased for public health settings, contact us


Contact Us

Connect with us

Subscribe to e-newsletter

facebook new  twitter new  linkedin new  youtubesquare 

Our Partners

  • carter
  • malarianomore
  • rollback
  • unitednations
  • worldvision