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Crovect Prevention Of Blowfly Sheep Pour On

Crovect Prevention Of Blowfly Sheep Pour On
800ml Bottle
Applicator Gun

  • 800ml Bottle £37.95
  • 2.2 litre Bottle £56.49
  • 5 litre Bottle £94.99
  • Applicator Gun £35.59

Selection of 4 products from

£35.59 to £94.99


For the treatment and control of ticks, headflies and biting lice on sheep. For the prevention and treatment of blowfly strike on sheep. POM-VPS.

Below is the product datasheet. This has been provided by the manufacturer and should always be provided with the medication.


Company name: Novartis Animal Health UK Ltd
Address: Frimley Business Park
GU16 7SR
Telephone: 01276 694402
Fax: 01276 694403


A mobile blue-coloured non-aqueous pour-on containing 1.25% w/v cypermethrin (cis:trans/80:20) for external application.


For the treatment and control of headflies. For the treatment of tick infestation with a persistent efficacy of 10 weeks (the majority of ticks killed within 3 hours), and treatment of biting lice in sheep. For the prevention and treatment of blowfly strike on sheep.

Dosage and administration

Crovect is administered by means of a recommended Crovect applicator as follows:
5 ml per 20 kg bodyweight, up to a maximum of 20 ml.

Bodyweight Dose Doses per litre
Up to 20 kg 5 ml 200
21–40 kg 10 ml 100
41–60 kg 15 ml 66
Over 60 kg 20 ml 50

Using the straight nozzle on the recommended Crovect applicator gun apply as a pin stream from the shoulders to the rump along the middle of the backline.
Sheep may be treated off-shears or anytime during the year.
Crovect Lice Pic
Adult sheep and lambs over 10 kg – 10 ml per 20 kg bodyweight, up to a maximum of 40 ml. One treatment will give 10 weeks cover.
Lambs under 10 kg – 5 ml followed 3 weeks later by a 10 ml application.

Bodyweight Dose Doses per litre
Up to 10 kg 5 ml 200
11–20 kg 10 ml 100
21–40 kg 20 ml 50
41–60 kg 30 ml 33
Over 60 kg 40 ml 25

Using the straight nozzle on a recommended Crovect applicator gun apply as a pin stream from the crown of the head to the top of the rump.
Crovect Ticks pic
5 ml per animal irrespective of size.
Apply to the top of the head between the ears, using the T-bar nozzle.
Take care not to apply the product in the sheep's eyes.
One application of Crovect before the start of the headfly season will give up to 4 weeks protection.
Re-treat as required.
Crovect Headfly Pic
Prevention of blowfly strike:

Bodyweight Dose Doses per litre
Up to 25 kg* 20 ml 50
25–40 kg 30 ml 33
Over 40 kg 40 ml 25

*Do not administer to animals of less than 12.5kg bodyweight at the blowfly prevention dose.
Apply as a fan-spray to the surface of the fleece on the back and hindquarters of the sheep using a recommended Crovect applicator gun fitted with a fan spray nozzle. Half the dose should be applied on the shoulders, back and flanks and half to the rump. The distance between the nozzle and the fleece should be approximately 20 cm. Each dose will require 2 or 3 sweeps to apply. THE PRODUCT WILL PREVENT BLOWFLY STRIKE ONLY ON AREAS COVERED BY SPRAY. One application will give 6–8 weeks protection. Re-treat as required.
Treatment of Blowfly Strike
Apply directly to all the affected parts at the rate of 2.5 ml per 100–150 cm2 (roughly the size of a hand). The T-bar nozzle should be used. Most strikes will require 5–10 ml. Ensure that all affected parts are treated. A single application is sufficient to ensure that larvae are expelled and killed within a few hours.
Crovect Blowfly Strike pic
This product contains a blue dye to aid in the identification of treated animals. The colour is temporary and will fade from the fleece within 48 hours of application.

Contra-indications, warnings, etc

Not to be used in lambs less than 1 week old.
Avoid treating very young lambs if the weather is unseasonably hot.
For the prevention of blowfly strike; do not administer to animals of less than 12.5kg bodyweight.
Take care not to apply in the sheep's eyes. This precaution should be observed particularly when treating breeds with little wool on their heads. Crovect minimises mothering-up problems after treatment. However, care must be taken not to apply the product right to the lamb's tail as a ewe recognises a young lamb by the smell of the tail area.
Operator Warnings
WEAR A DUST MASK when applying as a fan-spray for the prevention of blowfly strike.
WASH SPLASHES from skin and eyes immediately. If irritation persists seek medical advice immediately.
DO NOT EAT, DRINK OR SMOKE when using the product.
WASH HANDS AND EXPOSED SKIN before eating, drinking or smoking and after work.
Withdrawal Periods
Meat - Animals must not be slaughtered for human consumption during treatment. Sheep may be slaughtered for human consumption only after 8 days from the last treatment.
Milk - Not to be administered to animals producing milk for human consumption.
Environmental Warnings
HARMFUL TO FISH AND OTHER AQUATIC LIFE. Do not contaminate ponds, waterways and ditches with the product or the used container. Dispose of unused product and containers in accordance with guidance from your local waste regulatory authority e.g. The local regional office of the Environment Agency or SEPA
For external use only.
For animal treatment only.

Pharmaceutical precautions

Store in tightly closed original container, in a safe place. Do not store above 25°C. Protect from direct sunlight.
Store away from food, drink and animal feedstuffs.

Legal category


Packaging Quantities

0.8, 2.2 or 5 litre backpacks.

Further information

Crovect must be applied only with the recommended applicator gun as the product may have a detrimental effect on certain components of conventional dosing guns. Full operating and maintenance instructions, including details on the use of nozzles, are supplied with each applicator gun. Maintain applicator gun carefully to ensure accurate dosage.
Blowflies are attracted by dirty, damp wool or open wounds. The most common site for flystrike is the rump, due to soiling caused by diarrhoea and urine staining. The efficacy of Crovect is reduced in the presence of soiled and dirty wool. Therefore sheep must be crutched (dagged) regularly and appropriate worm control measures employed.

Marketing authorisation number


Need help or advice? Contact us:

  • Landline: 01582 842096
  • Mon - Fri: 8:30am - 5:00pm
  • Sat: 9:00am - 1:00pm (Collections only)
  • Email: [email protected]

All prices include VAT where applicable.

Delivery Information

How quickly do you deliver?

Under almost all products on our website is an Estimated dispatch time, check this for a delivery prediction specific to the item you are looking to purchase. These badges are updated live based on the stock levels we have and also those of our suppliers - so are usually very accurate, but cannot be guaranteed. In more general terms, we aim to dispatch all orders within 1 working day of receiving payment (and a prescription if required). If we cannot do so within 3 working days we will contact you by email.

What do you charge for delivery?

For UK delivery, we charge the following:

Order Total Weight Delivery
£0-£28.99 Under 2kg £2.99
2kg+ £4.99
£29-£38.99 Under 2kg Free
2kg+ £4.99
£39+ Under 2kg Free
2kg+ Free

Prices quoted are for delivery to all parts of mainland UK except certain Scottish postcodes (where the price is higher for items sent by courier. Delivery of food abroad (including Channel Islands, N. Ireland and other islands around the UK) is charged at a higher price and free delivery is not available. Temperature controlled products, such as Insulin, are also not always subject to the standard and/or free delivery options.

For full information on our delivery charges, including prices on heavy deliveries to Scotland and abroad, see our delivery information page.

We can deliver most items to all around the world, but prices do vary. The majority of light weight orders (less than 1.5kg) can be delivered for a flat rate of £10. For an accurate estimate of the delivery charge, please put the items you require in your basket and use the "Estimate Delivery" system on the shopping basket page (you only need to enter your country and postal/zip code) for a quick quote. For deliveries to the USA you may need to go to the checkout page and enter your full address to get a quote (as some services need your state in order to quote too). For more information on international deliveries, please see our delivery information page.

Delivery of aerosols

Due to restrictions aerosols can't be sent by Royal Mail. We appreciate your understanding.

Delivery of temperature controlled items

Some products, such as insulin and frozen food, need to be delivered in insulated packaging to prevent them from getting too warm (or too cold) during transit from us to you. Purchasing any of these items in your order will result in a £1.99 charge being added to the total to cover the high cost of the insulated packaging materials. You only pay the £1.99 once per order, regardless of how many temperature controlled items you purchase in that order.

How do I cancel or return an order?

Please call us as soon as possible if you need to amend or cancel an order on 01582 842096. If your order has been processed for dispatch we will be unable to cancel or amend the order. You will however be able to return your product for a full refund*.

To return an item, you must contact us by phone or email to arrange this BEFORE posting any product back to us. We will explain the process at this stage for you.

*For full details on returns, see our terms and conditions page.

Reviews (13)

Q & A

Below are some recent questions we've received regarding Crovect Prevention Of Blowfly Sheep Pour On, including answers from our team.

1 June 2018 at 5:26pm


bodie cook

can i shear my sheep straight after application?

  • Customer Service/Meds Advisor


Thank you for your query.

You can, however the product would be more effective if you shear the animals before an application of Crovect. This is just to allow for the product to do its job once in contact with adult and larval stages of blowfly.

I hope this helps.

25 July 2017 at 2:03pm

Correct prevention of fly strike


After treatment with crovect, prevention of blow how soon after can the sheep be taken to slaughter

  • Website Content Developer

Hi Jane,

Animals must not be slaughtered for human consumption during treatment. Sheep may be slaughtered for human consumption only after 8 days from the last treatment.

I hope this helps.