Blanket cattle worming should cease, warn animal well being specialists

 

Farms blanket-treating grownup cattle for roundworms have been urged to undertake a “take a look at, then deal with” strategy so that they not choose for resistance.

This recommendation, from Control of Worms Sustainably (Cows), got here amid experiences that some farmers have dosed all their cattle with a roundworm drench this autumn to kill the larvae, regardless of not realizing whether or not roundworms are current within the animals.

Ostertagia larvae can hibernate within the abdomen wall and emerge in giant numbers within the spring, inflicting extreme illness and dying.

See additionally: Tips to guard cattle well being from first housing to ending

Resistance risk

Carmarthenshire-based unbiased animal well being advisor Sally Harmer has seen examples of farmers routinely blanket-treating grownup cattle at autumn housing. This is a waste of money and time and results in resistant parasites, she warned.

She reminded farmers that grownup cattle are sometimes proof against roundworms and testing is the important thing to sustainable parasite management.

“Continuing to do that [blanket treatment], with out realizing whether or not spherical worms are current, will choose for resistant worms,” she mentioned.

“Some particular person cattle which can be younger or in poor situation could warrant treating, however this is not going to normally apply to the entire herd.”

What is Ostertagiosis?

  • A illness attributable to maturation of the Ostergia ostergi larvae
  • Unlike lungworm and liver fluke, it doesn’t normally trigger scientific illness in grownup cattle
  • The situation is described in two varieties:

Type one: Often seen throughout late summer time/early autumn. Sudden dying is uncommon, however extreme diarrhoea, weight reduction and lack of urge for food can lead to financial losses. Most extreme after a dry summer time when a moist spell results in a mass emergence of larvae on pasture.

Type two: Profuse unresponsive diarrhoea as larvae emerge from the abdomen wall later within the winter months. Treatment response is poor.

Source: NADIS

Professor Diana Williams, University of Liverpool, and Ms Harmer suggested the next:

  • If faecal egg counts have proven little or no roundworms via the summer time, then kind two threat is low.
  • Consult along with your vet via the winter and in case your vet recommends it, then a macrocyclic lactone may be prescribed to kill hibernating larvae in addition to any lungworms picked up on the finish of the grazing season.
  • Adult cattle shouldn’t want remedy, offering they’ve been uncovered to a degree of an infection as calves.
  • Ask your vet about blood assessments that reveal the extent of parasitic injury to the abomasal lining, and milk assessments for dairy herds.
  • Liver fluke will be monitored by taking a blood pattern two weeks after housing, notably on first season grazing calves.
  • A copra-antigen take a look at on a pooled faecal egg rely from the dung of 10 animals two months after housing can present if liver fluke is current.
  • A faecal egg rely discount take a look at can be utilized to find out whether or not the sometimes prescribed energetic for autumn – triclabendazole – will work, as that is product of alternative later within the yr. The take a look at will verify in case your farm is likely one of the rising variety of farms to have triclabendazole resistance.