Belev N, Ourouchev K, Naidenova N
Ann Rech Vet. 1978;9(4):915-7.
Industrial cattle-breeding in Bulgaria is characterized by large cattle-breeding complexes holding 500, 1,000 or 2,000 dairy cows; farms specialized in rearing calves for breeding purposes, and calves fattening units holding 2,000, 5,000 or 10,000 animals. A specific technology has been introduced for management purposes. This high concentration and specialization creates specific organisational problems for antiepizootic control measures. Bovine leucosis has been brought from abroad by imported breedings animals. A complex system for leucosis prophylaxis and control is obligatorily implemented. It is supervized and financed by the state. Particular care is taken of ensuring protective measures for import breeding animals. The infected farms are put under strict quarantine. The animals which show a positive reaction during complex diagnostic tests are slaughtered and the meat is used after heat-processing. The milk is heat-processed too and sent for further utilization. Calves born in infected farms are not fit for breeding purposes but for fattening only.
保加利亚的工业化养牛业的特点是，有饲养500头、1000头或2000头奶牛的大型养牛综合体；专门饲养用于繁殖目的小牛的农场，以及饲养2000头、5000头或10000头动物的小牛育肥单位。为管理目的引入了特定技术。这种高度集中和专业化给动物疫病防控措施带来了特定的组织问题。牛白血病是由进口种畜从国外传入的。必须实施一套复杂的白血病预防和控制体系。该体系由国家监管并提供资金。特别注意确保对进口种畜采取保护措施。受感染的农场被严格隔离。在综合诊断测试中呈阳性反应的动物被宰杀，其肉经过热处理后使用。牛奶也经过热处理后送去进一步利用。在受感染农场出生的小牛不适合用于繁殖，只能用于育肥。
