Gce Model Questions Vol1 2023 Agricultural Science Question 9

Practice essay / theory question 9 from the 2023 Gce Model Questions Vol1 Agricultural Science examination. This question covers Animal Diseases .

Gce Model Questions Vol1 2023 Agricultural Science Essay / Theory
Topic: Animal Diseases
Question 9 GCE_MODEL_QUESTIONS_VOL1 • 2023 • AGRICULTURAL_SCIENCE • essay

A mixed herd of cattle and sheep on a commercial farm in northern Nigeria has shown the following clinical signs over the past two weeks: sudden onset of fever, vesicular lesions on the mouth, tongue and interdigital spaces, loss of appetite and lameness. Morbidity in the herd is about 70 % while mortality is 5 %. The disease appears to spread rapidly among animals that share the same feeding and watering points. The farm manager reports that the last vaccination against this disease was carried out 18 months ago. The basic reproduction number (R₀) for the disease under typical farm conditions is estimated to be 5. Answer the following:

Question Parts

( a )
Identify the disease most likely responsible for the outbreak and give two key clinical features that support your identification.
( b )
Describe the epidemiological cycle of this disease, highlighting the main modes of transmission and the role of carriers.
( c )
Using the given R₀ value, calculate the minimum proportion of the herd that must be immunised (vaccinated) to achieve herd immunity. Show your working.
( d )
Propose three practical control measures that the farmer could implement immediately to curb the outbreak, and briefly justify each measure.

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About This Question

This is Gce Model Questions Vol1 2023 Agricultural Science Question 9. It is one of the essay questions from the 2023 Gce Model Questions Vol1 Agricultural Science examination.

The question covers Animal Diseases .

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