Often referred to as “hairy shaker disease”, Border Disease is caused by a pestivirus very similar to the one which causes Bovine Viral Diarrhoea (BVD) in cattle.  Border Disease has the ability to increase the proportion of barren ewes within a flock by 2-8% per year, with infected lambs growing on average 20% slower than uninfected lambs throughout the first six weeks of life.