1. Controlling External Parasites 4-H Veterinary Science Extension Veterinary Medicine Texas AgriLife Extension Service College of Veterinary Medicine and Biomedical Sciences Texas A&M System http://aevm.tamu.edu

2. Objectives Describe environmental management practices used to control external parasites Describe strategic administration of chemicals to control external parasites

3. Life Cycle of External Parasites Host Entry Exit Environment

4. Life Cycle of External Parasites Host Contact Host

5. Life Cycle of External Parasites Environment Attack Host Attack Host Environment

6. Break Life Cycle of External Parasites Reduce contamination of environment outside of animal Environment – nutrition Environment – sanitation Manure, mud, water Host – chemicals Optimal conditions, positive tests Environment – chemicals

7. Reduce suitability of environment inside of animal Host – nutrition

8. Increase resistance of animal Host – nutrition