Cheapest Cattle Fly Control
Fly control is a seasonal but substantial cattle care cost, covering pour-ons, ear tags, dust bags, and oral larvicides, often used in combination during peak fly season. Horn flies and face flies in particular can measurably affect weight gain and milk production, which is why most operations don't skip this category even when budgets are tight.
Because fly control products are bought per-head and reordered every season, the retailer price gap on the same product can meaningfully affect a herd's total seasonal cost.
Commonly Compared Products
Elanco CyLence Pour-On
Pour-on insecticide for horn fly and lice control.
Y-Tex Python Dust
Insecticide dust for pour-on or dust bag application.
Merck Ultra Boss Pour-On
Broad-spectrum pour-on insecticide.
Elanco Corathon Ear Tags
Season-long fly control tags, sold per box of 20.
Price Comparison
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Elanco CyLence Pour-On Cattle Insecticide, 16 fl oz
Elanco · Cyfluthrin 1% · Pour-on liquid
| Retailer | Package | Price | Price per fl oz | |
|---|---|---|---|---|
| ChewyBest unit price | 16 fl ozs | $27.99 | $1.749 | View → |
| Tractor Supply | 16 fl ozsListed by Tractor Supply as "CyLence Pour-On Livestock Insecticide, 1 pt." — same 16 fl oz size | $34.99 | $2.187 | View → |
Package sizes differ between retailers. Prices last checked on 2026-08-29. Prices and availability may change.
Y-Tex Python Livestock Insecticide Dust Shaker Can, 2lb
Y-Tex · Zetacypermethrin, Piperonyl butoxide · Dust
| Retailer | Package | Price | Price per lb | |
|---|---|---|---|---|
| Tractor SupplyBest unit price | 2 lbs | $14.99 | $7.495 | View → |
Package sizes differ between retailers. Prices last checked on 2026-08-29. Prices and availability may change.
Merck Ultra Boss Pour-On, 32oz
Merck · Permethrin 5%, Piperonyl butoxide 5% · Pour-on liquid
| Retailer | Package | Price | Price per oz | |
|---|---|---|---|---|
| ChewyBest unit price | 32 ozsListed by Chewy as "for Cattle, Sheep, Goats & Horses, 1-quart" — same 32oz size and species list | $45.95 | $1.436 | View → |
| Tractor Supply | 32 ozs | $59.99 | $1.875 | View → |
Package sizes differ between retailers. Prices last checked on 2026-08-29. Prices and availability may change.
Elanco Corathon Cattle Ear Tags, 20count
Elanco · Coumaphos (organophosphate) 50% · Insecticide ear tag
| Retailer | Package | Price | Price per tag | |
|---|---|---|---|---|
| ChewyBest unit price | 20 tagsList price $69.99 | $64.99 | $3.250 | View → |
| Amazon | 20 tags | $74.99 | $3.750 | View on Amazon → |
| Tractor Supply | 20 tagsListed by Tractor Supply and Amazon under the older "Bayer" brand name — Elanco acquired Bayer Animal Health in 2020; same product | $89.99 | $4.499 | View → |
Package sizes differ between retailers. Prices last checked on 2026-08-29. Prices and availability may change.
Why Do Prices Vary So Much?
Ear tags and pour-ons are sold by nearly every farm supply retailer, which creates real price competition — but per-head cost varies enough between suppliers that a mid-size herd can see a meaningful total difference. Buying before fly season starts is the most reliable way to avoid the seasonal markup.
Frequently Asked Questions
Are insecticide ear tags more cost-effective than pour-ons over a season?
Often yes for season-long control, since one tag application can last several months versus reapplying pour-on every few weeks.
How early should I buy fly control before the season starts?
Late winter to early spring, before demand and prices climb into early summer.
Can I rotate between different fly control products to prevent resistance?
Yes, and many extension programs recommend it — rotating active ingredients year to year helps slow resistance buildup.
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