Flies Economic Impact**

$4.19+ Billion Loss in the US*



*Dr. Dave Taylor 

1 Billion Loss Horn Flies

230 Million Loss Face Flies

750 Million Loss House Flies

250 Million Loss Stable Flies

  •        Horn Flies (click to read more)

    The economic loss to the North America cattle industry from horn fly infestation is over $1 billion per year.


    But why is it important to treat horn flies?

    • Reduced Reproductive Efficiency in Cattle (avg-15% on Pregnancy Rates)
    • In Yearling Steers Production losses 30lb during the grazing season.
    • Loses can be worst depending on Fly Population as well as Fly Season Duration.
    • In growing calves: 1.5 lb per week Production Loss
    • Disease Vector
    • Filiara Scars, Blind Quarters, Mastitis, Mammory Development in Heifers

    500 flies per animal

    loss of >80lbs./year

    And also because they can quickly get out of control

  •        Face Flies (click to read more)

    Cost associated with pinkeye, which is spread by face flies to healthy cattle, is estimated at over $230 million in the U.S.


    Face Flies "The Neglected Fly"

    • They gather around the eyes and muzzles of livestock
    • Sponge feeder and Scratchy mouth parts;
    • Their mouth parts are adapted for sponging up saliva, tears and mucus;
    • The complete life cycle from egg to adult requires 12-20 days, depending on climatic conditions.

    Decrease in milk


    Up to 65lb.

    weight loss

    Face Flies

    • Females feed on facial secretions to obtain protein for egg development
    • However the main problem is the transfer of the Pinkeye Disease (Moraxella bovis)
    • Pink eye clinical signs from mild to severe
    • Lay Eggs in Cattle Manure
    • Their feeding activity enhances trasmission of Moraxella bovis (Keratoconjunctivitis), Thelaziasis (Eyeworm Disease) and Parafilaria bovicola (Parafilaria Infection);
  •        House Flies (click to read more)

    The house fly can transmit 65 disease organisms to animals and humans. The economic loss in cattle due to transmission of these bacteria, like one which causes mastitis, is over $750 million in the U.S.


    House Flies

    • House flies harbor more that 100 different species of pathogenic organism.
    • Mouth, Feces, Hair Folicles on Legs
    • Studies have incriminated them in more that 65 human and animal diseases: They also can transport eggs and larvae of several parasitic worms.

    House Flies can Transmit

    Viral Diseases

    • Calves - Bovine Viral
    • Diarrhea (BVD)
    • Bovine herpes virus
    • (BHV-1) causing infections
    • Bovine Rhinitis (IBR)
    • Parainfluenza 3 (P13)
    • E Coli


    Bacterial Diseases

    • Pinkeye
    • Mastitis
    • Bacterial scours
    • Typhoid
    • Anthrax
    • Vibriosis
    • Clostridial Diseases


  •        Stable Flies (click to read more)

    Studies have shown that just 5 flies per animal will reduce feed efficiency and result in an average loss of $8.51 per animal per season. Total estimated annual loss to U.S. cattle industry is greater than $250 million.

    But why is it important to treat stable flies?

    • Have been shown to transmit mastitis
    • Vectors for bacterial and viral infections
    • Economic threshold = 2 to flies per leg
    • Loss of blood and loss of flesh
    • Annoyance

    20-60% in milk

    production loss


    weight loss

    Stable Flies

    • Will attack wide range of host animals
    • Persistent feeders inflicting a painful bite that causes considerable irritation
    • Primarily feed on the legs of animals


    Stable Flies also can drain a lot from a dairy

    "Stable Flies" irritate cattle during resting, feeding and milking. Research shows that high populations of stable flies can lower milk production by 15 to 30 percent.  (Stevenson and Cocke)


    As  few as 4 stable flies per cow can reduce production by 3% per month.
    (Tesas A&M Extension, "Integrated Pest Management of Flies in Texas Diaries")



    Stable Flies Decrease Milk Production
    Stable Flies were shown to decrease milk production by 3.3 lb/day (Freeborn)

    0.65 to 0.70 percent loss in milk and butterfat production per fly per cow. Controlling stable flies increased milk production by 10-20 percent. (Bruce and Decker)

    Dr. Steve Jones (Northwest Research and Nutrition) 4 lbs per day reduction Milk Production OVERNIGHT


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Flies Economic Impact**