Flashcards in DL: parasitic bronchitis Deck (9):
What do you need to consider when deciding which anthelmintic is best for a disease outbreak of bovine lungworm?
- efficacy against different stages of D. viviparus
- dairy cow stage of lactation (eprinomectin has no milk withdrawal time but is 3-4 time more expensive than Fenbendazole). Consider number of animals to be treated, stage of lactation, milj quota and if it has been reached, farmer reliability.
Prognosis of D.viviparus infection
- Early stage - goo
- Late stage (large worm burden) - marked loss of production, death, deterioration may be rapid with tx as dead and young worms can be reaspirated back down respiratory tree)
How could you manage a clinical outbreak of D.viviparus?
- move to safe pasture
(e.g. sheep pasture or newly seeded pasture or grazed by cattle vaccinated earlier that years)
- NSAIDs (reduce severity of host reaction to parasite)
- ABs (prophylactic)
What control strategies are available for controlling husk in low risk areas of the control? 2
• control strategies (e.g. vaccination) would not be necessary and would certainly not cost effective
• anthelmintic treatment of
o newly-purchased animals (to prevent introduction of infection onto the farm if purchased from an area where lungworm is endemic)
o clinical cases ( individual basis)
What control strategies are available for controlling husk in areas with previous history of husk? 3
• introduce vaccination (if not already practised)
• vaccinate newly-purchased animals prior to turn out
• anthelmintic treatment (modern drug, prolonged residual activity against lungworm) if insufficient time to vaccinate newly-purchased animals (of unknown vaccination status)
What control strategies are available for controlling husk in areas with a recent disease outbreak I.e. partly through a grazing season)? 3
• anthelmintic treatment (modern drug, prolonged residual activity against lungworm to protect animals for the remainder of the grazing season)
• introduce vaccination next grazing season (if not already practised)
Why might clinical lungworm disease be getting more common in adult dairy cattle? 3
- reduced vaccination of calves
• Cost of vaccination of calves - reduces starting calfhood vaccination and continuing vaccination
• Cheaper alternative control methods, e.g. strategic anthelmintic tx BUT animals are unlikely to be immune to lungworm at the end of the grazing season
• Changes in pasture management practices, e.g. adult cows put onto calf pasture, increased stocking density
How much does a Huskvac vaccine cost?
Approximately £10 per calf for 2 doses in 2015