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Ewe Disease

Overview

Prevention
Protection
Sheep

Conditions to watch out for in pregnant ewes

Pregnant ewes are subject to a range of preventable diseases. These fall under:

Metabolic Diseases

Metabolic diseases are difficult to diagnose in the early stages. When the obvious visible symptoms appear the metabolic disease is established, losses are to be expected and treatment effectiveness is variable. Prevention is more cost effective and economically efficient when the sub-clinical and chronic losses are account for. The primary metabolic diseases are:

Pregnancy Toxaemia (Twin Lamb Disease)
Hyocalcemia (Milk Fever)
Grass Tetany (Grass Staggers)

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Pregnant_Sheep_Field

Infectious diseases, prevented by vaccination

Preventable infectious disease have a severe economic and welfare impact when a sheep flock is afflicted. When the obvious visible symptoms appear the infectious disease is established, losses are to be expected and treatment effectiveness is variable. Prevention is more cost effective and economically efficient when the sub-clinical and chronic losses are account for. The primary preventable infectious diseases are:

Infectious diseases

Clostridial diseases

Pulpy Kidney (Enterotoxemia)

Tetanus

Black Disease

Black Leg

Malignant Oedema

Cheesy Gland (CLA)

Erysipelas arthritis

Ovine Johne's Disease (OJD)

Scabby Mouth

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Locomotion diseases (lameness), preventable by management

Lameness and locomotion diseases are difficult to control, treatment is costly and have a severe impact on animal welfare. Prevention through quarantine and management operations are the preferable methods of limiting the economic impact of lameness and locomotion diseases.

The primary causes of sheep lameness include:

Footrot and Scald

Foot Abscess

Ovine Interdigital Dermatitis (OID)

Shelly Hoof

Erysipelas arthritis

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Locomotion diseases (lameness)

Parasitic diseases 

Effective parasite management is the key to limiting the impact of parasitic diseases. The integrated management of pasture, genetics, quarantine, chemical treatment and management operations are key to effective parasite management. The historical reliance on chemical treatment has caused severe parasite resistance Australia wide.  

The core concepts of effective parasite management include:

Physical sign of worms

Monitoring for worms

Internal parasites and life-cycles

Drench resistance

Best practice drenching

Solutions for internal parasites

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Parasitic diseases

Further Reading

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