Chabertia ovina

Chabertia ovina is a species of parasitic nematode, commonly known as the large-mouthed bowel worm. It primarily infects the intestines of ruminants, particularly sheep and goats, causing significant health issues and economic losses in the livestock industry.

Taxonomy and Classification

Chabertia ovina belongs to the phylum Nematoda, class Secernentea, order Strongylida, and family Strongylidae. It is one of the many gastrointestinal parasites that affect ruminants.

Morphology

The adult worms are characterized by their large buccal capsule, which is used to attach to the mucosa of the host's intestines. Males typically measure around 13-20 mm in length, while females are slightly larger, ranging from 15-22 mm. The worms are white or cream-colored and have a cylindrical shape.

Life Cycle

The life cycle of Chabertia ovina includes both free-living and parasitic stages. The eggs are passed in the feces of the infected host and hatch into larvae in the environment. The larvae undergo several molts before becoming infective third-stage larvae (L3). These L3 larvae are ingested by grazing ruminants and migrate to the intestines, where they mature into adult worms and begin the cycle anew.

Pathogenesis and Clinical Signs

Chabertia ovina attaches to the mucosa of the large intestine, causing damage and inflammation. This can lead to symptoms such as diarrhea, weight loss, and anemia in severe cases. The presence of these worms can also predispose the host to secondary infections.

Diagnosis

Diagnosis is typically made through fecal examination, where the characteristic eggs of Chabertia ovina can be identified. In some cases, adult worms may be observed during necropsy.

Treatment and Control

Treatment involves the use of anthelmintic drugs, which are effective against the adult worms. Control measures include pasture management to reduce the exposure of livestock to infective larvae and regular deworming programs.

Economic Impact

Infections with Chabertia ovina can lead to significant economic losses due to reduced weight gain, decreased milk production, and increased veterinary costs. Effective management and control strategies are essential to minimize these impacts.

Related Pages

• Nematoda
• Strongylidae
• Parasitic diseases of animals
• Anthelmintic