SHEPHERDS with a flock barren rate greater than 2% can now ask their vet for a subsidised blood test to establish whether the likely cause of the problem is toxoplasmosis.

Expertis Barren EweCheck - a diagnostic scheme supported by MSD Animal Health - is being made available from vets until March 31, 2016.

Toxoplasmosis is the main infectious cause of early embryo loss in sheep and a common cause of barrenness, abortion and weak lambs born alive. Research has shown that almost all flocks in Great Britain have been in contact with the toxoplasma parasite, which means all breeding sheep should be considered at risk.

According to MSD Animal Health technical manager and vet, John Atkinson, the main reason for such high levels of disease is that sheep can become infected very easily. "Sheep pick up the toxoplasma parasite from the environment and so normal biosecurity measures are not enough to control the disease.

"Infected cats shed toxoplasma eggs in their faeces and sheep become infected when they ingest these eggs from contaminated pasture, feed and water. The eggs can survive in the environment for more than a year, which means farmers need to take steps to protect their sheep.

"The disease can be controlled effectively by a simple vaccination regime. What's more, the costs of a prevention programme can be easily covered by a reduction in future flock barren and abortion rates. Every ewe should be vaccinated before it breeds, simply because of the widespread disease threat and the significant financial losses caused by toxoplasmosis," he added.