Brand: OSMONDS Gold Fleece Sheep Dip

Company: ANIMAX

FORMULATION: liquid concentrate for dipping sheep

ACTIVE INGREDIENT(S): Diazinon (= dimpylate): 62% = 62 g/L

CHEMICAL CLASS of the active ingredient(s): Organophosphate


PARASITES CONTROLLED (spectrum of activity)



1. Preparation for dipping:
Place the dip concentrate container into the cage on the base-plate so that the coloured corner of the container label is aligned with the coloured corner of the base-plate. This will tilt the container to allow withdrawal of the maximum amount of dip concentrate. Place the dispensing base-plate on level ground at the edge of the dip tank and feed the dispensing hose through the hole in the base-plate so that the hose hangs down into the dip tank. Where splash-boards are fitted the base-plate should be sited so that the dispensing hose is fed through an existing gap in the barrier. For extra security the base-plate can be attached to a solid object near to the edge of the dip tank using twine or wire threaded through the cage at the rear of the base plate.
2. Initial fill of dip concentrate into dip bath:
Connect gun inlet hose (2) to container outlet valve (1) and connect gun outlet (3) to dispensing hose (5). Carefully pump the trigger of the gun until the gun reservoir and outlet tubes are full of product. Then dispense the required number of 60 ml volumes of dip concentrate for initial charging of the dip tank (see container label for details). The dispensing gun is fixed to deliver 60 ml only and is sealed for safety reasons. It must not be disassembled. When filling the gun reservoir, to ensure accuracy, it is important to wait until the plunger has returned completely before dispensing the dip concentrate. It is recommended that the operator keeps a tally of the number of volumes dispensed. After every ten x 60 ml dispensings, using a dry gloved finger, press down on the top of container inlet valve (4) for a few seconds. This is to allow air to enter the container to relieve any negative pressure.
3. Replenishment of dip bath with product:
Replenishment with one 60 ml delivery of concentrate treats 12 sheep.
  • Baths less than 2250 litres (500 gallons) must be replenished after every 36 sheep dipped (3x60 ml deliveries from the dispensing gun) and the bath must be filled with water to its original level.
  • Baths of 2250 litres (500 gallons) or more must be replenished after every 96 sheep dipped (8x60 ml deliveries from the dispensing gun) and the bath must be filled with water to its original level.
Approaching the end of the days dipping, when replenishing the dip bath for the final time, carry out the first 1x60 ml delivery for a bath less than 2250 litres (or the first 6x60 ml deliveries for a bath greater than 2250 litres) and allow the gun to refill by releasing the trigger. Then disconnect gun inlet hose (2) from container outlet valve (1) and connect gun inlet hose (2) to hose (6) ensuring that the non-return valve (7) on the end of the hose is secured to the clip (8) on the carrying handle. Now pump the gun two more times and the final 120 ml of dip concentrate will be delivered into the dip bath. Replace transit cap onto the part used container. Now follow instructions on how to wash and store the dispensing kit (see ‘Washing Instructions’).
4. To change containers during dipping: If a container is emptied during dipping disconnect gun inlet hose (2) from empty container outlet valve (1). Immediately re-connect to a new container and carefully pump the trigger of the gun until the reservoir is full. When disconnected, do not try to operate the delivery gun until the correct connections (step ii) have been made. Store the empty container safely until the end of the day’s dipping.
Do not rinse empty containers until the end of the day’s dipping (see ‘Washing Instructions’). This is to avoid the possibility of the introduction of water into part-filled dip concentrate containers. Even very small amounts of water can affect the long-term stability of the dip concentrate.

Amounts to be administered and administration route

To prepare the bath:
  • Measure the required volume of cold soft water into the bath. Fit the Dispensing kit (available from your Osmonds Gold Fleece supplier) to the dual valved lid of the container as described in section 4.5 above.
  • Dispense the required amount of product into the dip tank via the dispensing kit in the proportion of 600ml Gold Fleece to 900 litres (200 gallons) of water. (i.e dispense 10 x 60ml amounts of dip concentrate into the dip tank – see section 4.5 above. Stir the bath thoroughly from end to end before commencing dipping and dip on the day the dip is prepared.
To replenish the bath:
  • Baths of less than 2250 litres (500 gallons): Add 180 ml of dip after every 36 sheep dipped and restore the bath with water to its original Volume (i.e dispense 3 x 60ml amounts of dip concentrate into the dip tank – see section 4.5 above).
  • Baths of 2250 litres (500 gallons) or more: Add 480 ml of dip after every 96 sheep dipped and sufficient water to restore the bath to its original volume (i.e dispense 8 x 60ml amounts of dip concentrate into the dip tank see section 4.5 above). When a bath becomes foul, however, always empty it and refill with fresh dip. Dispose of all wash remaining at the end of a day’s dipping.
  • Fouling of the dip wash reduces dip effectiveness. Therefore, do not dip more than 1 sheep per 2 litres of dip wash that was in the bath at the start of dipping. For example, if the total volume of wash in your dip bath was 1000 litres (220 gallons) you should not dip more than 500 sheep no matter how many times you have replenished and topped-up the bath. You should then empty, clean and recharge the bath with fresh dip wash.
  • Dipping: Sheep must be totally immersed in a sheep bath and all parts of the sheep except the head and ears, must remain immersed for not less than one minute. Keep the sheep moving in the bath and plunge the head under at least once. Never hold the head down or the sheep will be liable to swallow or inhale some of the wash.
  • Control of Ticks: Ewes: Dip ewes in Spring before lambing. If the infestation is severe dip again 6 weeks later (excluding young lambs). Hogs and other sheep should be dipped as soon as possible after ticks appear.
  • Not to be mixed with any other dip.

Read the complete product label carefully and ensure thorough accomplishment of all the use instructions.


  • LD50 (acute oral) in rats: for the a.i. 1250 mg/kg
  • LD50 (acute dermal) in rats: for the a.i. >2150 mg/kg
    • Estimated hazard class according to the WHO: III, slightly hazardous.

Suspected poisoning? Read the article on diazinon = dimpylate safety in this site.

Withholding periods (=withdrawal times) in days for meat & milk (country-specific differences may apply: read the product label)

  • Meat & offal: UK 49 days
  • Milk for human consumption: UK Not to be used on animals producing milk for human consumption.

WARNING !!!: Never use on humans, dogs or cats.

Diazinon and all organophosphates (e.g. coumaphosdichlorvos, phosmet, etc.) etc. are highly toxic to birds, fish and aquatic invertebrates.

Organophosphate dips are submitted to very strict operator safety precautions and dip wash disposal regulations. Read the product label carefully and ensure strict accomplishment of all safety instructions.


Risk of resistance? LOW.

There are reports on field resistance of Psoroptes ovis (sheep scab) against some organochlorines and organophosphates in Argentina, and against a few organophosphates and synthetic pyrethroids in the UK. However it does not seem to be a widespread problem and such products are still effective in many properties in these countries.

This means that if this product does not achieve the expected efficacy against the mentioned parasites, it is probably due to incorrect use rather than to a resistance problem. Incorrect use is usually the most frequent cause of product failure.

So far there are no reports on resistance of blowfly maggots, lice, keds or ticks to organophosphates in the UK or Europe. However, resistance of blowflies and lice to these and other chemicals has been reported elsewhere (e.g. Australia, New Zealand).

Alternative chemical classes/active ingredients to prevent resistance of external parasites through product rotation:

These alternative products may not be available in all countries, or may not be available for dipping, or may not be effective against all the concerned parasites.

Learn more about resistance and how it develops.


Are the active ingredients of this product ORIGINAL* or GENERICS**?


*Meaning that they are still patent protected and generics are not yet available
**Meaning that they have lost patent protection and may be acquired from manufacturers of generic active ingredients other than the holder of the original patent.

COUNTRIES where this brand/product is marketed: UK, Ireland
GENERIC BRANDS available? YES, but rather few with diazinon in the UK. This brand contains itself generic diazinon and is marketed by BIMEDA in the UK.

Click here to learn more about GENERIC vs. ORIGINAL drugs.

For an overview on the most used antiparasitic spray, dip & dust BRANDS click here.


Diazinon (also called dimpylate) is a veteran broad-spectrum organophosphate introduced in the 1950s by GEIGY (later CIBA-GEIGY → NOVARTIS) that has been very abundantly used worldwide in agriculture, hygiene and veterinary insecticides. In sheep, diazinon was particularly appreciated for the control and prevention of sheep scab mites, blowfly strike and lice. It has a high affinity for wool lipids, where it dissolves after administration and remains for a long period of time ensuring several weeks and even months protection against re-infestation.

Usage of diazinon products in sheep strongly declined after several countries imposed very strict safety precautions and dip wash disposal regulations (e.g. the UK & Australia) for all dips in the late 1990s. As a consequence, using these products became rather inconvenient and often also expensive. Soon after, NOVARTIS, the market leader for diazinon products for sheep, divested all its organophosphates for strategic reasons, including its diazinon sheep brands (NEOCIDOL, TOPCLIP). Nowadays, in many countries sprays and dips containing diazinon, other organophosphates and even synthetic pyrethroids have been vastly replaced by injectable macrocyclic lactones (e.g. doramectinivermectin, moxidectin, etc.) that have become affordable, are much more convenient than sprays & dips and as effective. Diazinon is still abundantly used worldwide in insecticide-impregnated ear-tags for fly control on cattle.

Used as recommended this product is highly effective against established infestations of mites (incl. sheep scab), blowfly strike, lice, and keds and ensuresl several weeks protection against re-infestation. Control of ticks is usually less effective. But to ensure efficacy it is crucial to dip the sheep correctly. To learn more about correct sheep dipping click here.

All organophosphates are veteran pesticides developed in the 1950s-1960s and are basically contact insecticides. This means that when the parasite comes in contact with it (e.g. during the blood meal, after landing on a treated host, etc), the active ingredient that impregnates the host's hair coat penetrates through the cuticle (i.e. the "skin" of insects and other arthropods) into its organism and disturbs essential biological processes in the parasite's body, in this case its nervous system.

After administration to livestock or other animals, organophosphates do not have a systemic mode of action, i.e. they are not transmitted to the parasite through the blood or the host. Topically administered organophosphates are very poorly absorbed through the skin of the hosts, and what is absorbed is quickly broken down and/or excreted. Consequently the concentration reached in the blood is too low to kill blood-sucking parasites.


This article IS NOT A PRODUCT LABEL. It offers complementary information that may be useful to veterinary professionals and users that are not familiar with veterinary antiparasitics. 

Information offered in this article has been extracted from publications issued by manufacturers, government agencies (e.g. EMEA, FDA, USDA, etc.) or in the scientific literature. No guarantee is given on its accuracy, integrity, sufficiency, actuality and opportunity, and any liability is denied. Read the site's DISCLAIMER.

In case of doubt contact the manufacturer or a veterinary professional.