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Agriculture for Secondary Schools

on the blood of the host animal, causing irritation, annoyance, wounds, and in
some cases, transmitting serious diseases such as anaplasmosis, theileriosis and
trypanosomiasis. The most common external parasites in beef cattle include ticks,
lice, fleas, tsetse flies, and stable flies (refer to Figure 10.8). Regular inspection
of animals for signs of parasite infestation is important for early detection and
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control. Combining chemical application with good hygiene and environmental
management practices provides effective long-term control of external parasites.
Figure 10.8 shows examples of common external parasites that affect cattle,
while Table 10.2 summarises the main effects caused by each external parasite
and how they can be effectively managed.

Louse
Tick Flea

Tsetse fly Stable fly
Figure 10.8: Examples of common external parasites that affect cattle

Table 10.2: Common external parasites, their effects and management methods

External Effects caused Management methods
parasite
• Sucks blood • Use acaricides through dipping
or spraying every two weeks
• Causes wounds
• Remove ticks manually if the
Tick • Transmits diseases such as
anaplasmosis and theileriosis infestation is light
• Clear bushes to reduce tick
habitats

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