AT a recent meeting with a new dairy client I was informed that the herd was ‘closed’ as no cattle had been purchased for 20 years. However, this herd is typical of many – expanding cow numbers without expanding housing facilities on the main holding, requiring housing and grazing at premises away from home. On visiting the other premises there were bulling and in-calf heifers grazing with nose-to-nose contact with a neighbour's cattle. Managing biosecurity under such circumstances is challenging. The …