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304 North Cardinal St.
Dorchester Center, MA 02124
What Is A Sheep Drench? Using a drench gun, they are applying an anthelmintic dose into the throat of each sheep to kill internal parasites. People sometimes confuse drenching with dipping, which involves applying a chemical solution to kill external parasites, often by getting the sheep saturated.
Why do they drench sheep? Sheep can be drenched at critical times with the aim of preventing the carry-over of worms from one season to the next. Drenching stops the contamination of pasture with worm eggs, so preventing the build-up of large populations of in- fective larvae on pastures.
Do you have to drench sheep? If your sheep are for breeding, a drench around 4 weeks before lambing should see the ewe through the stress periods of late pregnancy and lamb raising. Lambs should be drenched a week or two before weaning.
When should you drench sheep? Lambs may require drenching at 12- 14 weeks even if not weaned at this time as recommended. In some cases where early weaning is not practised, ewes also may need an extra drench, because of greater exposure to contaminated pasture.
Sheep Drenching, How it works, How it’s done? To administer a drench we would use a ‘drench gun’ and give the required dose orally to the sheep or lamb. This is done forcibly by restraining the sheep and its head, you then place the ‘drench gun nozzle’ into the mouth and dose the sheep.
Ewes should only be wormed once a year at lambing time; this will reduce the number of eggs on the pasture so that there are less for lambs to pick up. Lambs have little resistance to worms in their first grazing season but this develops with time.
Levamisole is a short acting clear drench. Levamisole is still highly effective against barber’s pole worm and Nematodirus on most properties. Nematodirus is often a problem after drought or in lambing paddocks as the egg is resilient and can survive in hot, dry conditions for long periods.
Drenching too often or not following a set program, is also a problem. As a general guideline, non-breeding sheep should need a single drench a year, and lambing ewes and weaners two drenches. Please keep in mind that conditions on your property and in your region will ultimately affect how many drenches you need.
Ivomec (ivermectin) sheep drench is the preferred and primary product used to deworm sheep by most shepherds. It treats adult and fourth-stage larvae of gastrointestinal roundworms, lungworms, and all larval stages of nasal bots.
Ivermectin Sheep Drench is formulated only for administration to sheep; do not use in other species. The recommended dose level is 3 mL of Ivermectin Sheep Drench, containing 2400 mcg ivermectin, which is sufficient to treat 26 pounds of body weight.
Tapeworm infestations. While segments of tapeworms are often seen in the faeces of growing lambs in the UK they exert no adverse effects on growth rate and treatment is not usually considered necessary. The use of group 1-BZ wormers in lambs will remove tapeworm infection.
The worms are visible during necropsy. The symptom most commonly associated with barber pole worm infection is anemia, characterized by pale mucous membranes, especially in the lower eye lid; and “bottle jaw,” an accumulation (or swelling) of fluid under the jaw.
A typical sign of a worm problem is unthrifty sheep. An unthrifty sheep is one that is not eating properly, is losing condition, tends to lag behind the mob when moved and, in severe cases, is clearly weak. A worm problem often (but not always) results in sheep scouring and becoming daggy.
You can be creative with administering Garlic Juice to Sheep: Garlic and garlic juice is know in many countries to be an excellent dewormer. It is administered to sheep in many creative ways: Added to kelp, added to dry feed, mixed with molasses and salt, mixed with bread-molasses-milk and salt, etc.
DO NOT WITH-HOLD FOOD FROM HEAVILY PREGNANT EWES. Only use wormers when needed – Faecal Worm Egg Count tests can be run to see if your sheep need wormed.
Higher producing ewes rearing more than one lamb will need a source of digestible undegraded protein (DUP), to support good milk yields. Soya bean meal or protected soya can be included in the ration for this purpose.
If pasture is limited and you can’t move onto rested areas then it’s important that lambs are wormed every three or four weeks from six weeks of age.
Sheep farmers can reduce worm burdens in lambs and improve their growth rates by treating ewes with a long-acting wormer prior to lambing, a recent study has found. Around two weeks before lambing until six weeks post lambing ewes are more likely to shed worm larvae due to decreased immunity.
Administer 2 mL per 100 lb body weight for cattle and 1 mL per 50 lb body weight for sheep. Unused portion of prepared solution can be stored for up to 3 months. 48 hours slaughter withdrawal for cattle.
Drenched sheep should be moved to clean pasture – repeating treatment every three weeks is not sustainable. For chronic fluke cases and for strategic dosing always use an alternative to triclabendazole wherever possible.
Cydectin Oral Drench for sheep contains moxidectin. It is a wormer for both ewes and lambs. Cydectin for sheep has persistent activity against key sheep parasites. It provides up to 35 days of persistent protection against both Haemonchus and Teladorsagia worms.
Toxicity due to overdose is rare. However, in sick, light or water deprived sheep even a normal dose of an OP can be fatal. Levamisole is probably the most inherently toxic drench with a safety margin of twice to three times the dose.