1·The pathological changes of 38 cases of experimental colibacillosis in chicks were observed.
观察了38例雏鸡实验性大肠杆菌病的病理变化。
2·The preventive effects of ceftiofur sodium on an experimentally induced colibacillosis in day-old chicks were evaluated by single subcutaneous injection prior to the inoculation of e.