Merck Ultra Boss Pour-On
Merck Ultra Boss Pour-On
Item # 602027799
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Merck Animal Health Ultra Boss Pour-On Insecticide (Permethrin And Piperonyl Butoxide) is used for beef, dairy and lactating cattle; sheep, goats and horses. Target species include: lice, horn flies, face flies, horse flies, stable flies, mosquitoes, black flies and ticks. Protection against horn flies lasts for about 8 weeks.
- Low-volume dosage of pour-on insecticide reduces time and labor
- Effective horn fly control for 8 weeks. Also controls face flies
- Season-long lice control with one application (January through April)
- Special Note: for cattle, horses, sheep and goats, repeat treatment as needed but not more than once every two weeks. for horses, do not saddle horse for 6 hours after application and refrain from washing down area of application. for optimum lice control, two treatments at 14-day intervals are recommended. Ultra Boss Pour-On Insecticide is not effective against cattle grubs
Permethrin and PBO
| Brand | Merck |
|---|---|
| Country of Origin | Imported |
| Active Ingredients | Permethrin |
| Animal Type | Cattle, Goat, Horse, Sheep, Calves |
| Application Method | Pour |
| Concentrated or Ready to Use | Ready to Use |
| Features | Horn fly control for 8 weeks |
| Longevity | 8 weeks |
| Package Quantity | 1 |
| Targeted Fly Types | Lice, Horn Flies, Horse Flies |
| Manufacturer Part Number | 121358 |
Have a question?
Start typing your question and we'll check if it was already asked and answered.
1 - 10 of 18 Questions
Newest questions
Q: Can it be used on poultry?
3 days ago1 Answer
- A: Howdy neighbor! No, you should not use Merck Ultra Boss Pour-On Insecticide on poultry. According to its official EPA product label, this specific oil-based formula is strictly registered for use on cattle, calves, horses, sheep, and goats. Applying a heavy, ready-to-use livestock "pour-on" to birds is highly dangerous because it can cause severe chemical skin burns, mat their feathers (ruining their natural temperature regulation), and potentially result in fatal toxicity.3 days agoHelpful?
Q: Dosing is 30ml per 100lbs with a max of 30ml (equal to 1 oz). Do you mix or dilute this with some type of liquid to apply because it'll be pretty difficult to get an ounce evenly distributed down the neck and backline of a cow.
10 days ago1 Answer
- AI-generated, Human-approvedA: No, this product is ready to use and should not be mixed or diluted. It is designed as a low-volume pour-on insecticide to be applied directly along the back and down the face of the animal.10 days agoHelpful?
Q: Can this product be mixed with diesel fuel and used in a back rubber for goats?
17 days ago1 Answer
- A: Merck Ultra Boss Pour-On should be used only according to the product label directions. It is not listed as approved for mixing with diesel fuel or use in a back rubber for goats. We recommend following the labeled application method or contacting Merck Animal Health for guidance on alternative uses.14 days agoHelpful?
Q: What is waiting time on butchering
a month ago1 Answer
- A: Howdy neighbor! There is absolutely zero days of waiting time required for butchering cattle or sheep after applying Merck Ultra Boss Pour-On Insecticide.a month agoHelpful?
Q: Does this product work for goat mites?
2 months ago1 Answer
- A: Howdy neighbor! Ultra Boss Pour-On is not labeled to treat goat mites and will not effectively clear up an infestation.2 months agoHelpful?
Q: does the Merck Ultra Boss Pour-On come in less than 1 gallon amounts?
2 months ago1 Answer
- A: Yes, there is an option for a 32 oz bottle on the product page.2 months agoHelpful?
Q: Is this safe for pregnant cows
2 months ago1 Answer
- A: Howdy neighbor! Yes, Merck Ultra Boss Pour-On is completely safe to use on your pregnant cows during any stage of their gestation. This topical insecticide works as a contact treatment with minimal systemic absorption, meaning it poses absolutely no danger to the developing fetus when applied correctly.2 months agoHelpful?
Q: How many cows can one 32oz treat
2 months ago1 Answer
- A: Thank you for your question. The number of cattle that can be treated will vary based on the weight of the animals. According to the manufacturer, the dosage is 3 mL per 100 lb of body weight for cattle, applied along the topline. Customers can use that dosage rate to estimate how many animals a 32 oz bottle will treat based on their herd’s average weight.2 months agoHelpful?
Q: Can I apply with a spray bottle ?
4 months ago1 Answer
- AI-generated, Human-approvedA: The specified application method for this product is as a pour-on, rather than a spray. It is designed for low-volume dosage to be applied along the back and down the face of the animal.4 months agoHelpful?
Q: How long do you need to avoid the area on the animal after applying ultra boss? We like to love on our animals but we don’t want to get the stuff on us.
2 years ago
Originally posted on SCBT
1 Answer
- A: We would suggest reaching out to the manufacturer for your concerns. Thank you, SCAH Team2 years ago
1 - 10 of 18 Questions
Q&As
Have a question?
Start typing your question and we'll check if it was already asked and answered.
1 - 10 of 18 Questions
Newest questions
Q: Can it be used on poultry?
3 days ago1 Answer
- A: Howdy neighbor! No, you should not use Merck Ultra Boss Pour-On Insecticide on poultry. According to its official EPA product label, this specific oil-based formula is strictly registered for use on cattle, calves, horses, sheep, and goats. Applying a heavy, ready-to-use livestock "pour-on" to birds is highly dangerous because it can cause severe chemical skin burns, mat their feathers (ruining their natural temperature regulation), and potentially result in fatal toxicity.3 days agoHelpful?
Q: Dosing is 30ml per 100lbs with a max of 30ml (equal to 1 oz). Do you mix or dilute this with some type of liquid to apply because it'll be pretty difficult to get an ounce evenly distributed down the neck and backline of a cow.
10 days ago1 Answer
- AI-generated, Human-approvedA: No, this product is ready to use and should not be mixed or diluted. It is designed as a low-volume pour-on insecticide to be applied directly along the back and down the face of the animal.10 days agoHelpful?
Q: Can this product be mixed with diesel fuel and used in a back rubber for goats?
17 days ago1 Answer
- A: Merck Ultra Boss Pour-On should be used only according to the product label directions. It is not listed as approved for mixing with diesel fuel or use in a back rubber for goats. We recommend following the labeled application method or contacting Merck Animal Health for guidance on alternative uses.14 days agoHelpful?
Q: What is waiting time on butchering
a month ago1 Answer
- A: Howdy neighbor! There is absolutely zero days of waiting time required for butchering cattle or sheep after applying Merck Ultra Boss Pour-On Insecticide.a month agoHelpful?
Q: Does this product work for goat mites?
2 months ago1 Answer
- A: Howdy neighbor! Ultra Boss Pour-On is not labeled to treat goat mites and will not effectively clear up an infestation.2 months agoHelpful?
Q: does the Merck Ultra Boss Pour-On come in less than 1 gallon amounts?
2 months ago1 Answer
- A: Yes, there is an option for a 32 oz bottle on the product page.2 months agoHelpful?
Q: Is this safe for pregnant cows
2 months ago1 Answer
- A: Howdy neighbor! Yes, Merck Ultra Boss Pour-On is completely safe to use on your pregnant cows during any stage of their gestation. This topical insecticide works as a contact treatment with minimal systemic absorption, meaning it poses absolutely no danger to the developing fetus when applied correctly.2 months agoHelpful?
Q: How many cows can one 32oz treat
2 months ago1 Answer
- A: Thank you for your question. The number of cattle that can be treated will vary based on the weight of the animals. According to the manufacturer, the dosage is 3 mL per 100 lb of body weight for cattle, applied along the topline. Customers can use that dosage rate to estimate how many animals a 32 oz bottle will treat based on their herd’s average weight.2 months agoHelpful?
Q: Can I apply with a spray bottle ?
4 months ago1 Answer
- AI-generated, Human-approvedA: The specified application method for this product is as a pour-on, rather than a spray. It is designed for low-volume dosage to be applied along the back and down the face of the animal.4 months agoHelpful?
Q: How long do you need to avoid the area on the animal after applying ultra boss? We like to love on our animals but we don’t want to get the stuff on us.
2 years agoOriginally posted on SCBT
1 Answer
- A: We would suggest reaching out to the manufacturer for your concerns. Thank you, SCAH Team2 years ago
1 - 10 of 18 Questions
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Reviews
1 to 4 of 21 Reviews .
1 – 4 of 21 Reviews
Most Recent
Anonymous
Review 1
5 out of 5 stars.
Fly repellant
25 days ago
t works well on cows
SweepstakesYes
4C Cattle
Review 1
5 out of 5 stars.
Good Stuff!
11 months ago
Very good product. One of best products we have tried to keep flies at a minimum.
Product Used Since : 9/5/2025
Originally posted on SCBT
Julie G
Review 1
5 out of 5 stars.
Quick Easy Fly Control
a year ago
I only have a couple steers but I saw immediate results with fly control after applying Ultra Boss. Quick and easy to use.
Product Used Since : 7/3/2025
Originally posted on SCBT
Equinista
Review 1
5 out of 5 stars.
Happier horses
a year ago
Love this product. I combine it with fly spray when the flies are extremely bad.
Product Used Since : 7/8/2025
Originally posted on SCBT