Drenches Case Study

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Drenches is a liquid formulation for oral administration that is used to kill internal and external parasites especially in sheep. It is used in the worm control on any farms. Drenches is also known as anthelmintics as they contain active ingredients that kill the helminths in the stomach. Basically, there are three major types of drenches which are the suspensions, solutions and emulsions. (P.Junquera, 2015) Drenches can be a “broad spectrum” when they treat an extensive range of internal parasites or “narrow spectrum” when they treat only a restricted range of internal parasites. (Sheep Worms: Signs, Management Plan, Control, & Drenching, 2015) There are several “chemical family” groups in drenches as each of them have a specific
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(g) Others
• Monepantel is effective in killing some gastrointestinal roundworms.
(P.Junquera, 2015)

Procedure of Drenching
1. The drench container is shaken.
2. Label is checked whether the correct dose is given. Dose rate for all livestock should be calculated based on the heaviest livestock in the mob.
3. The drench gun is checked whether is calibrated to deliver the correct dose.
4. The drenching gun nozzle is inserted into the mouth of the sheep from the side, between the incisor and molar teeth while making sure that the nozzle is above the tongue.
5. After the delivery of dose, make sure that there is no spitting out of the drench from the sheep.
6. The drenching gun is cleaned by pumping the cold water through it after all mob has been drenched. Avoid using soapy water as it may damage the rubber seals in the drenching gun.
7. The rubber seals inside the drenching gun can be lubricated using vegetable oil after the cleaning of drenching gun.
8. The withholding period for the certain drench being used is checked.
9. The unused drench is stored in the original container out of the sunlight.
10. If old drench is used, the expiry date should be checked
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(Drench Resistance, n.d.) Selection for drench resistance occur when worms in a sheep are exposed to a drench. Some of the worms can survive over certain drench actives because they have the genes which is drench resistance. There are cases where some worms are partly drench-resistant as well at which they can only survive lower but not full doses of the treatment given. As a consequence, those worms that are stay alive the treatment will continue to yield more eggs which give rise to the infectious larvae on a meadow. The life cycle of worms continues as the sheep consume them. Each and every treatment will cause the worms to mutate, thus increasing the chances of the worms to become fully drench-resistant. (Managing Drench Resistance,

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