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This Durvet 1000 mL bottle is the standard-size workhorse for mid-sized cattle operations. The ivermectin concentration at the typical 5 mg/mL gives you 10 mL dosing per 550 lb of body weight, which translates to roughly 100 head of 550-pound calves per bottle. Real-world owners report consistent knockdown of lice, mites, and internal roundworms with a simple pour down the midline.

Users specifically note the product’s effectiveness on external parasites is visible within days — cattle stop rubbing posts and scratching against gates. The plastic bottle has a wide mouth for easy pouring into a dosing gun or measuring cup, and the fluid viscosity is thin enough to run cleanly through standard applicators without clogging. Multiple verified reviews confirm the same batch works on hogs and even external parasite control on poultry when applied properly.

The value proposition is straightforward: you get a reliable ivermectin pour-on at a per-milliliter cost that competes with local feed stores, without the need for a prescription or extra shipping restrictions. Owners of herds up to 50 adult cows consistently reorder this size twice a year, matching the typical spring and fall deworming schedule without overbuying product that would expire before use.

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This 1-liter (33.8 fl oz) bottle from Durvet is the same standard 5 mg/mL ivermectin pour-on formulation but in a smaller, more manageable package for smaller herds or hobby-farm operations. If you run 10 to 20 head of adult cattle, this volume covers your spring and fall treatments without half the bottle oxidizing in the shed. The packaging dimensions — 6.25 x 3.75 x 9 inches — make it easy to store in a refrigerator or cooler if you need to keep it stable in summer heat.

Verified reviews highlight the convenience of the smaller size for multi-species use. One reviewer dips approximately 25 chickens at a time using a half-bottle mixed in warm water, which demonstrates the flexibility of the ivermectin molecule for external mite and louse treatment beyond cattle. Another owner with a small herd specifically calls out this “medium-sized portion” as the sweet spot — not too big that it goes bad, not too small that you run out mid-season.

The price per milliliter is slightly higher than the 1000 mL or 169 fl oz options, but the reduced upfront investment and minimized product waste make this the smarter financial choice for operations under 30 head. The threaded cap seals well, and the factory seal under the cap is intact on every unit, giving you confidence the product hasn’t been tampered with or evaporated during shipping.

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While this is technically an equine paste formulation at 1.87% ivermectin, it belongs on this list because many cattle owners keep it in their medicine cabinet for targeted individual dosing or for horses on the same property. Each syringe is calibrated to deliver a precise dose for a 1,250-pound horse, and the plunger mechanism is shorter than many competing brands, which gives better leverage when treating a resistant animal. The 6-pack format covers six horses or multiple smaller animals with measured partial plunger doses.

Owners of small mixed herds appreciate that this paste formulation bypasses the pour-on absorption issues that can occur when cattle have thick winter coats or muddy hides. For an individual cow that needs extra parasite knockdown or a sick animal that won’t eat medicated feed, the syringe lets you dose directly onto the back of the tongue. The taste is reportedly unpleasant — several human users mention it unpalatably bitter — but the product works reliably on both internal and external parasites.

The packaging change noted in recent reviews (syringes no longer wrapped in individual plastic sleeves) means the cardboard box may arrive slightly bent during shipping. However, the syringe plungers and caps remain sealed, so the product integrity is unaffected. For operations that need a precise, non-pour-on option for spot treatments or multi-species use, this 6-pack offers a solid backup to a liquid pour-on program.

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This is the largest liquid ivermectin pour-on container in the lineup at 169 fluid ounces, designed specifically for operators running 100+ head of adult cattle. At the standard 10 mL per 550 lb dose, this single container covers roughly 500 doses for 550-pound animals. For a 100-head herd of 1,100-pound cows, this volume provides about 250 applications — enough for two full herd treatments with margin to spare. The per-milliliter cost is significantly lower than the smaller bottles, which makes it the clear economic choice for commercial-scale operations.

Real-world users confirm the same 5 mg/mL ivermectin concentration does its job on internal roundworms, lungworms, and external parasites including lice and mites. One reviewer specifically notes the dye in the formulation helps track application coverage along the topline — when cattle leave the chute, you can see exactly where the product landed. This is a practical advantage when training new crew members or checking that every animal in a group got a full dose.

The 169 fl oz bottle is heavier (over 10 pounds full) and requires a sturdy dosing gun setup or a dedicated pour-on applicator with a pump. It is not ideal for freehand pouring — the weight and volume make accurate dosing harder than with the 1-liter option. Owners who rotate through this size consistently reorder three to four times per season, confirming that the product performs reliably batch after batch without formulation changes.

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This 5-pound powder formulation is a different delivery mechanism — it is designed to be mixed into sweet feed or grain, not poured onto the animal’s back. When you have animals that are difficult to handle in a chute, or if you want to avoid the handling stress of individual pour-on application, this feed-through option gives you a practical alternative. Horses, in particular, reportedly find the taste appealing — one reviewer notes that horses started eating the sweet feed mix before the dewormer was fully stirred in.

The multi-species label means a single bag can treat horses, cattle, and other livestock, which simplifies inventory for operators with mixed herds. The 5-pound quantity is relatively small, covering approximately 10 to 15 adult animals depending on dosage instructions. Because this is a feed additive, the active ingredient exposure is through the digestive tract rather than transdermal absorption, which means the onset of action is slower compared to pour-on ivermectin, but the blanket coverage is easier to achieve with group feeding.

The main limitation is that you cannot guarantee each animal receives a full dose if you have a herd with a dominant feeder who hogs the grain. Additionally, the powder formulation may settle in the feed tub, requiring thorough mixing. For owners who run a small operation with docile animals that group-feed well, this budget-friendly entry point eliminates chute time entirely and gives acceptable results for routine maintenance deworming between full pour-on treatments.