Correct Option: D. Drenching Explanation of the Correct Answer Drenching is a method used to administer liquid medication directly into the mouth of an animal, ensuring that it reaches the stomach and intestines where it can effectively target internal parasites, including tapeworms. In sheep production, drenching is particularly effective for controlling tapeworm infestations because it allows for precise dosing of anthelmintic (deworming) medications that are specifically formulated to kill or expel tapeworms. How Drenching Works: 1. Preparation: The appropriate anthelmintic drug is selected based on the type of tapeworm present and the weight of the sheep. 2. Administration: The sheep is restrained, and a drenching gun (a device designed to deliver liquid medication) is used to squirt the medication into the back of the sheep's throat. 3. Absorption: The medication travels down the esophagus into the stomach and intestines, where it acts on the tapeworms, either killing them or causing them to detach from the intestinal wall so they can be expelled. Why Other Options Are Incorrect

• A. Dusting: This method involves applying a powder formulation to the animal's skin or environment. Dusting is generally used for external parasites (like lice or mites) and is not effective for internal parasites such as tapeworms. Tapeworms reside in the intestines, so a topical application would not reach them.
• B. Spraying: Similar to dusting, spraying involves applying a liquid formulation to the animal's skin or environment. This method is also primarily used for external parasites and does not target internal parasites like tapeworms. The medication would not be ingested, making it ineffective for controlling tapeworm infestations.
• C. Dipping: Dipping is a method where animals are submerged in a solution to control external parasites. While it can be effective for certain external parasites, it does not address internal parasites like tapeworms. Dipping does not deliver medication to the digestive system, where tapeworms reside.

Summary of Key Points

• Drenching is the most effective method for controlling tapeworms in sheep because it delivers medication directly to the digestive system.
• Dusting, spraying, and dipping are methods used for external parasites and do not effectively target internal parasites like tapeworms.
• Proper administration of the drenching technique ensures that the sheep receives the correct dosage of anthelmintic medication.

Revision Summary

• Drenching is the correct method for controlling tapeworms in sheep.
• Other methods (dusting, spraying, dipping) are ineffective against internal parasites.
• Always select the appropriate anthelmintic based on the type of tapeworm and the sheep's weight.
• Ensure proper administration techniques to maximize the effectiveness of the treatment.