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 | Sheep, Goat, Cattle, Calves, Horse |
| 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 | Horn Flies, Lice, 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 15 Questions
Newest questions
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.28 days agoHelpful?
Q: Does this product work for goat mites?
a month ago1 Answer
- A: Howdy neighbor! Ultra Boss Pour-On is not labeled to treat goat mites and will not effectively clear up an infestation.a month agoHelpful?
Q: does the Merck Ultra Boss Pour-On come in less than 1 gallon amounts?
a month ago1 Answer
- A: Yes, there is an option for a 32 oz bottle on the product page.a month agoHelpful?
Q: Is this safe for pregnant cows
a month 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.a month agoHelpful?
Q: How many cows can one 32oz treat
a month 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.a month agoHelpful?
Q: Can I apply with a spray bottle ?
3 months ago1 Answer
- AI-generatedA: 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.3 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
Q: I use your product on my miniature pet cows. Can I use Utra Boss on our pet potbelly pigs for fly control ? I like idea of pour on versus spray that might be longer lasting.but not sure if this is safe for pigs as you do not list them? Please advise
3 years agoOriginally posted on SCBT
1 Answer
- A: Hello Renee, The Ultra Boss Pour-on Insecticide is labeled by the manufacturer for Cattle, Sheep, Goats, and Horses. We cannot recommend any off-label use of this product. Thank you, SCAH3 years ago
Q: We have a pot belly pig that is 163!lbs and lives in the barn with our goats and big pigs- can we use ultrabiss for her as well?
3 years agoOriginally posted on SCBT
1 Answer
- A: Hello, This product is labeled for Cattle,Horses, Sheep and Goats. We recommend reaching out to the manufacturer regarding using this on a pig. Thank you, SCAHealth3 years ago
Q: Hello, Is this product safe to use on pregnant goats?
4 years agoOriginally posted on SCBT
1 Answer
- A: Hello, This product is designed to be used safely of lactating cows and goats. for information on afe use in pregnant animals we recommend consulting with a veterinarian or reaching out to the manufacturer. Thank you, SCAHealth4 years ago
1 - 10 of 15 Questions
Q&As
Have a question?
Start typing your question and we'll check if it was already asked and answered.
1 - 10 of 15 Questions
Newest questions
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.28 days agoHelpful?
Q: Does this product work for goat mites?
a month ago1 Answer
- A: Howdy neighbor! Ultra Boss Pour-On is not labeled to treat goat mites and will not effectively clear up an infestation.a month agoHelpful?
Q: does the Merck Ultra Boss Pour-On come in less than 1 gallon amounts?
a month ago1 Answer
- A: Yes, there is an option for a 32 oz bottle on the product page.a month agoHelpful?
Q: Is this safe for pregnant cows
a month 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.a month agoHelpful?
Q: How many cows can one 32oz treat
a month 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.a month agoHelpful?
Q: Can I apply with a spray bottle ?
3 months ago1 Answer
- AI-generatedA: 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.3 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
Q: I use your product on my miniature pet cows. Can I use Utra Boss on our pet potbelly pigs for fly control ? I like idea of pour on versus spray that might be longer lasting.but not sure if this is safe for pigs as you do not list them? Please advise
3 years agoOriginally posted on SCBT
1 Answer
- A: Hello Renee, The Ultra Boss Pour-on Insecticide is labeled by the manufacturer for Cattle, Sheep, Goats, and Horses. We cannot recommend any off-label use of this product. Thank you, SCAH3 years ago
Q: We have a pot belly pig that is 163!lbs and lives in the barn with our goats and big pigs- can we use ultrabiss for her as well?
3 years agoOriginally posted on SCBT
1 Answer
- A: Hello, This product is labeled for Cattle,Horses, Sheep and Goats. We recommend reaching out to the manufacturer regarding using this on a pig. Thank you, SCAHealth3 years ago
Q: Hello, Is this product safe to use on pregnant goats?
4 years agoOriginally posted on SCBT
1 Answer
- A: Hello, This product is designed to be used safely of lactating cows and goats. for information on afe use in pregnant animals we recommend consulting with a veterinarian or reaching out to the manufacturer. Thank you, SCAHealth4 years ago
1 - 10 of 15 Questions
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1 to 4 of 20 Reviews .
1 – 4 of 20 Reviews
Most Recent
4C Cattle
Review 1
5 out of 5 stars.
Good Stuff!
10 months ago
Very good product. One of best products we have tried to keep flies at a minimum.
Product Tested : 9/5/2025
Originally posted on SCBT
Julie G
Review 1
5 out of 5 stars.
Quick Easy Fly Control
11 months 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 Tested : 7/3/2025
Originally posted on SCBT
Equinista
Review 1
5 out of 5 stars.
Happier horses
11 months ago
Love this product. I combine it with fly spray when the flies are extremely bad.
Product Tested : 7/8/2025
Originally posted on SCBT
Emi Lu
Review 1
5 out of 5 stars.
Expensive but works great
a year ago
Expensive but works for about 2-3 weeks without reapplication
Product Tested : 5/15/2026
Originally posted on SCBT