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SS3: AGRICULTURAL SCIENCE - 1ST TERM

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  1. Crop Improvement | Week 1
    9 Topics
    |
    1 Quiz
  2. Animal Improvement | Week 2
    6 Topics
    |
    1 Quiz
  3. Animal Health Management I - Introduction | Week 3
    7 Topics
    |
    1 Quiz
  4. Animal Health Management II | Week 4
    5 Topics
    |
    1 Quiz
  5. Animal Health Management III | Week 5
    7 Topics
    |
    1 Quiz
  6. Aquaculture | Week 6
    11 Topics
    |
    1 Quiz
  7. Apiculture or Bee-keeping | Week 7
    10 Topics
    |
    1 Quiz



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Topic Content:

  • Animal Diseases and Their Causes/Agents
    • Pathogenic diseases: Bacteria, Viruses, Protozoa, Parasites & Fungi
    • Nutritional diseases: Rickets, Ketosis, Milk Fever, Osteomalacia, Encephalomalacia, etc.
    • Diseases caused by inanimate objects

Animal diseases can be classified according to their causes into three (3) groups: Pathogenic diseases, Nutritional diseases, Diseases caused by inanimate objects. In this topic we will be discussing each of these classifications.

A. Pathogenic Diseases:

These are diseases caused by living organisms and they include:

i. Bacteria:

Bacteria cause both infectious and contagious diseases e.g. Tuberculosis, Brucellosis, Anthrax, etc.

structure of bacteria

Bacteria are single-celled organisms, visible under a microscope. They have various shapes, some are spherical (cocci), some are rod-like (bacilli), and some are covered or spiral (spirilla) and may possess flagella or whip-like tails.

classification of bacteria according to their shape

They reproduce by binary fission and under unfavourable conditions, bacteria reproduce by spore formation.

ii. Viruses:

They cause highly infectious and contagious diseases e.g. Rider Pest (Plague), Foot and Mouth, Newcastle disease, etc.

virus

 

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