Protecting cattle from flies is essential for animal comfort, weight gain, and overall health. Pour-on insecticides offer convenient, topical protection that suits many herds. This guide highlights five effective pour-on products and practical buying considerations to help you choose the right option for beef and dairy cattle, including lactating cows. Each product section links to its Amazon listing for quick access, with key features summarized to aid comparison.
Summary of Selected Products
| Product | Brand | Key Insect Targets | Notes |
|---|---|---|---|
| Ultra Boss Pour On | Merck | Flies, lice | Natural compatibility with veterinary practices |
| CyLence Pour-On 6 Pint | Elanco | Face flies, horn flies, lice | Ready-to-use, for beef & dairy |
| Clean-Up II Pour-On | Elanco | Flies, ticks, lice | IGR included; multi-species pest control |
| Gardatis Pour-On | Atticus | Flies, ticks, lice | IGR with permethrin; convenient pour-on |
| Permectrin CDS Pour-On | Elanco | Flies, lice, ticks | Ready-to-use; multi-species |
Merck Ultra Boss Pour On: A Practical Pour-On for Cattle

Merck’s Ultra Boss Pour On is a ready-to-use pour-on product for cattle, designed to integrate with standard veterinary practices. The formulation emphasizes compatibility with conventional veterinary approaches and supports practical on-farm use. Target pests include common flies and lice, helping reduce irritation and potential disease transmission. The product is described as manufactured in the United States, aligning with domestic distribution and support. For farmers seeking a straightforward pour-on option that cooperates with existing regimens, Ultra Boss provides a familiar tool in the fly-control arsenal.
CyLence Pour-On Insecticide | 1 Pint

CyLence Pour-On provides targeted control of face flies, horn flies, and sucking and biting lice on beef and dairy cattle, including lactating cows. This ready-to-use solution requires no mixing and uses minimal material per treatment, simplifying on-farm application. CyLence can be used year-round on cattle of all ages and sizes, making it a flexible option for mixed herds or seasonal fly pressure. The product is formulated to deliver effective pest control with a straightforward pour-on method that minimizes handling time.
Clean-Up II Pour-On Insecticide with IGR

Clean-Up II Pour-On combines insecticide power with an insect growth regulator (IGR) to disrupt the life cycle of lice and eggs on beef and dairy cattle, including lactating animals, as well as various fly species. The formulation targets multiple pests, offering broad-spectrum protection for multi-pest control on a single animal. It’s designed for pour-on use with no pre-slaughter or milk-withholding period, making it convenient for routine herd health management and ongoing pest suppression.
Gardatis Pour-On Insecticide with IGR

Gardatis Pour-On from Atticus combines 5.0% permethrin with 3.0% diflubenzuron (IGR) to knock out both adult insects and their eggs. This dual-action formula targets a wide range of pests, including various flies, ticks, and lice on cattle and horses. The ready-to-use pour-on is suitable for beef and dairy cattle, including lactating cows, as well as mature horses. The dual-active approach provides a robust defense against recurring infestations while minimizing manual handling time.
Permectrin CDS Pour-On Insecticide

Permectrin CDS Pour-On is designed for multi-species pest control, with a focus on horn, face, and stable flies alongside lice and ticks. It is ready-to-use and suitable for beef cattle, dairy cattle (including lactating), sheep, and horses, as well as their premises. The product’s concentrated yet ready-to-use formulation supports efficient on-farm application without dilution, helping sustain effective pest management across varying herd sizes and housing setups.
CyLence Pour-On Insecticide | 6 Pint

CyLence Pour-On 6 Pint offers the same targeted protection as the pint variant but in a larger volume, ideal for larger herds or frequent treatments. It controls face flies, horn flies, biting lice, and sucking lice on beef and dairy cattle, including lactating cows. Ready-to-use and versatile for year-round use, this option supports efficient treatment planning for operations with higher animal counts or longer fly seasons.
Buying Guide: Key Purchase Considerations
When selecting a cattle pour-on, consider pest targets, animal type, and lactation status to align with herd needs. Look at the product’s active ingredients, presence of an IGR, and whether the formulation is ready-to-use or requires dilution. Some products offer dual-action formulas that address both active insects and their eggs, potentially reducing re-infestation. Compatibility with existing veterinary protocols can simplify adoption, while the ability to treat multiple species (including horses or sheep) may benefit mixed farming operations. Always follow label directions for dosage, application areas, and re-application intervals to ensure safety and efficacy.
Effectiveness depends on fly pressure, herd size, and application timing. For larger operations, choosing a higher-volume option or a multi-pest solution can reduce workload. For farms with lactating cattle, ensure the product is approved for use on milk-producing animals and respect any withholding recommendations. If you operate in a region with diverse pest pressures, a product with broad-spectrum action and an IGR can provide extra protection. Finally, verify supplier support and accessibility of the product in your state to maintain consistent pest control over seasons.