Reminder for dairy farmers using NMR’s HerdWise system for Johne’s recording.
NMR customers must remember that the Herdwise system is changing.
Within the current ‘traffic light’ system, a cow’s classification is based on her last four test results. This means that it can change over time and a cow that has been ‘red’ (two positive tests) could revert back to being ‘amber’ or even ‘green’ if she has further negative results.
There is now a large body of research to show that cows that have been classified as red should be treated as a risk for their lifetime, even if they have subsequent negative tests. To reflect this, from 25th April any cow that has ever been classified as red will remain flagged as a red for life, regardless of subsequent test results.
This means that farmers may see a change in the number of red cows in their next HerdWise report, as the system upgrade will pick up those cows that were red in the past and have now reverted to amber or green. This upgrade will allow farmer and vet to keep better track of those cows that pose a risk of spreading Johne’s disease and means that high risk cows will always be flagged at the top of the HW report.