Animal Diseases, Animal Health - Animal Science - Lecture Slides, Slides of Biology

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Animal Diseases

Disease

• Broad definition – not being at ease or uncomfortable
• Producers have a vested interest to keep their animals healthy

Sick animals

• Usually display outward signs of illness
• Animal may be droopy, go off feed and water, be restless, have a dull haircoat

Infectious diseases

• Caused by microorganisms that invade the animal’s body
• Usually contagious diseases that the animal can pass to another animal

Bacteria

• Many are beneficial
• Those living in the stomachs of ruminant animals aid in digestion

Bacteria

• Useful in production of foods such as cheese and sauerkraut
• Many can be harmful
• Invade the cells of an animal’s body

Toxin

• Substance that causes harm to an organism
• A poison

Harmful bacteria

• When large numbers invade, the animal becomes ill
• Type and form of the illness depends on the type of bacteria that invades the animal

Bacillus

• Rod shaped
• Single, pairs, or arranged in chains
• Cause some serious diseases in animals

Bacillus

• Anthrax
• Tetanus
• Blackleg
• Intestinal coliform
• Salmonella and tuberculosis

Spirilla

• Live very well in the reproductive tracts of animals
• Leptospirosis
• Vibrosis and spirochetosis

Most bacteria

• Can be controlled by the use of antibiotics
• Penicillin was one of the first
• Produced from extracts of molds

Viruses

• Very tiny particle of matter composed of a core of nucleic acid and a covering of protein that protects the virus

Viruses

• Have characteristics of both living and nonliving material
• Are on the borderline between living and non living