10 Best Livestock Fly Control 2026: Covers Cattle, Horses, Poultry

Unlike full-body sprays that run off wounds, Farnam Swat Ointment adheres to healing cuts and insect bites on horses and dogs. It reliably repels flies from sensitive areas, but heavy fly activity can require reapplication every few hours. The strong chemical scent is polarizing and lingers — best kept in the barn rather than applied around faces you will handle. For owners managing fly bites on ears or protecting open sores, this ointment fills a specific gap in a fly control routine.

This three-pack of metered aerosol cans works well when paired with an automatic dispenser, killing flies reliably around barns. The scent is noticeably more pleasant than other fly sprays. However, the nozzles can detach after installation, which makes the can unusable. This limitation means the product fits best for buyers who already own a compatible dispenser and are willing to accept occasional nozzle issues.

Absorbine UltraShield EX kills flies on contact and creates a visible barrier that keeps mosquitoes and biting insects away from horses and dogs. The ready-to-use spray offers immediate knockdown without mixing, making it a convenient choice for barn or trail. However, the strong citronella-like scent is noticeable, and under heavy fly pressure the protection can fall short of the 17-day claim, often requiring daily reapplication. This spray is best for horse owners who value quick knockdown and don't need coverage for cattle.

These pellets are readily eaten by horses, making it easy to add a daily dose of the insect growth regulator novaluron to their feed. Over several weeks, the compound passes through the digestive system and stops fly larvae from developing in manure, gradually reducing the overall fly population around the barn. This approach works best for multi-horse operations where manure management is already a routine, and owners can plan ahead to start feeding before fly season begins. It is not a quick knockdown solution and relies on consistent dosing as part of a broader fly control program.

Gordon's Permethrin 10 is a straightforward concentrate that controls flies and ticks on livestock when mixed per label. One quart makes many gallons, offering low cost per application. The strong motor oil-like odor and milky residue may be off-putting — best for outdoor use. It has fewer reviews than the top pick, but works well for those comfortable with concentrates.

Martin's 13.3% permethrin concentrate provides maximum potency for diluting into large volumes, making it budget-friendly for acreage treatments. Its lack of livestock-specific labeling and strong chemical odor, plus safety risks to cats, mean it fits best for experienced users treating barn structures or outdoor areas where animals are not directly present.

Permectrin II covers more livestock species than any other concentrate in its price range, including cattle, horses, poultry, swine, sheep, and goats. Labeled for spray, fogger, back-rubber, and paint-on application, with up to 30 days of residual protection on treated animals. At mid-range pricing, a single 32 oz bottle produces up to 32 gallons of finished spray – enough for multiple animals over the season.

This product suits livestock farmers who need one solution for several animal types and are comfortable mixing concentrate. For small operations with a single animal type, a ready-to-use horse spray is simpler. The strong chemical odor when mixing is noticeable and may linger – those sensitive to chemical smells should use in a well-ventilated area. Accurate dilution is required to avoid waste or under-application; a separate sprayer is necessary.

With the lowest cost per ounce among ready-to-use sprays, this 128 oz water-based refill covers large areas quickly – unlike spot-on wound treatments. Protection fades within hours, so daily reapplication is necessary. Best for barns on a budget or dog owners wanting an economical spray, but skip it if you need all-day protection.

Durvet Permethrin 10% is a cost-effective concentrate labeled for a wide range of livestock species, making it economical for multi-species farms. However, its performance claims rest on manufacturer specifications rather than user-verified feedback. Buyers comfortable with mixing should evaluate based on label data.