Page 215 - Agriculture_Form_3

Agriculture for Secondary Schools

External Effects caused Management methods
parasite
• Causes itching, hair loss, and • Apply insecticidal dusts or
skin damage pour-ons
Louse
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• Improve hygiene in animal
shelters
• Itching • Treat using appropriate
insecticides
Flea • Skin irritation
• Restlessness • Clean, disinfect and change
bedding regularly
• Transmits trypanosomiasis • Use fly traps and screens
• Weakness and weight loss • Apply insect repellents
Tsetse fly
• Clear breeding sites around
water bodies
• Bites cause pain and blood • Eliminate breeding grounds
loss (wet organic matter)
Stable fly
• Reduces feeding and • Use fly traps
productivity • Apply suitable insecticides

Internal parasites live inside the body of cattle, mainly in the stomach, intestines,
and blood. These parasites interfere with digestion and assimilation of food,
leading to poor health and reduced productivity. The most common internal
parasites include roundworms, tapeworms, and flatworms, also called liver flukes.
Figure 10.9 shows examples of common internal parasites that affect cattle.

Roundworm Tapeworm Flatworm/Liver fluke

Figure 10.9: Examples of common internal parasites that affect cattle
Controlling internal parasites involves strategic deworming. Deworming
is recommended at the start of the dry season and again at the onset of rains.
Different types of deworming substances should be used over time to prevent

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