Nematodes of Cattle Flashcards
Most important, common nematodes in temperate regions
Cooperia oncophora
Ostertagia ostertagi
Dictyocaulus viviparus (Bovine lung worm)
Most obvious pathological lesion of Ostertagia ostertagi
Abomasal lesion
Gastric gland with hyperplastic change
Loss of cellular differentiation
Central orifice marking exit of worm
Resolution over ~2 months
Outline Abomasal pathophysiology of Ostertagia o.
HCl secretion reduced: pH increases
Gastrin is secreted
Pepsinogen does not convert to pepsin
Hypergastrinaemia
Control of PGE in Cattle
Grazing management
Anthelmintics
Cattle lung worm
Dictyocaulus viviparus (Bovine lung worm)
Clinical Dictyocaulosis when does it occur in calves
Classically’ in first grazing season (FGS) weaned calves in summer and autumn
Acquired Immunity to Lungworm
Resistance to colonisation of lungs by larvae, which are trapped in the mesenteric lymph nodes
Lasts ~6 months
Destruction and elimination of larvae/adults from lungs
Lasts >24 months
Baermann technique
The Baermann technique is used to separate larvae from faecal material
Lungworm Diagnostic
Faecal larvae
Immunity (antibodies) in blood and milk
Eosinophils
Current Tools For Lungworm Control
Anthelmintics (Strategic/Therapeutic)
Vaccination
Grazing management
Anthelmintics for treatment of Lungworm
Injection & topical Moxidectin
Oral Fenbendazole
