BVD eradication scheme is a serious step forward
Published 03/01/2012 | 05:00
I pulled my collar up to protect against the harsh wind as I headed out to a heifer calving the other night. She was sick to calve all day and was now logged as a call to a possible twisted womb. This was the first of this year's calves on this farm and the farmer was all agog about the new BVD test on all newborn calves. This BVD eradication programme is one serious step forward. Hats off to all concerned.
This initiative has the ability to save the farming world millions of euros from the outset. The ear punch test makes use of a novel laboratory test that can identify these PI (persistently infected) calves the moment they hit the ground. The PI calf is the production factory for the BVD virus, and plucking it out at the earliest occasion is the best way to stop the spread of the virus in its tracks.
Before the advent of the ear punch test, we were identifying these infected animals by way of a blood test only. The blood test was being carried out on adult animals primarily and these adults would then be taken off the farm by whatever which way.
The trouble was that the damage was already done by then. The adult could be two or more years old, having actively pumped out the virus to all its comrades. Plucking out semi-mature PI animals is tantamount to plucking ragwort from the pasture many weeks after the seeds have spread. The ear punch test, on the other hand, is like picking the same ragwort well before it ever goes to seed.
All said, the new BVD eradication scheme has not been without its teething problems. One of these is worth a short mention. Well into the planning stages, it became obvious that legislation to singularly outlaw the sale of a known PI animal would not be in place before the onset of testing. This led some farm organisations, and our own Veterinary Ireland organisation, to shout a halt to proceedings.
There was a big fear that some PI positive calves would be presented for sale by a farmer who may wish to be shut of them once identified.
However, the Sale of Goods Act and other existing legislation was deemed to cover this, and some policy changes by the DVO and, more recently, the marts has now made it most difficult for anyone to try to pass on a PI calf. This, thankfully, satisfied the vets and farmers alike.
But let's just pull back for one moment. There's a lesson for us all in this point. What happens when a herd proves positive on a test for Johne's? Or again, where a herd is shown to have a problem with Neospora, or with IBR for that matter?