BENNINGTON — Vermont is at a greater risk of a major outbreak of animal-borne disease if it does not begin tracking its livestock, says the state's agriculture chief. While local health officials are confident in their ability to deal with the avian flu, Steve Kerr, the state's agriculture secretary, is discouraged by efforts to block related preparations. A debate has emerged in the state and nation over the need to track livestock. The yet-to-be implemented National Animal Identification System is a federal plan to ear-tag and track the movements of all domestic livestock in the United States by 2009. Many...