| persistent activity of doramectin injectable formulation against experimental challenge with haemonchus placei in cattle. | two studies were conducted in north america to evaluate the persistent activity of doramectin injectable formulation against experimental challenge with haemonchus placei. in both studies, calves were randomly assigned to 1 of 4 treatment groups (n = 10 per group) or a larval viability group (n = 2). calves were treated subcutaneously in the lateral midline of the neck with saline (1 ml/50 kg) on day 0, or with doramectin (200 mg/kg = 1 ml/50 kg) on day 0, 7, or 14. animals used to assess larval ... | 1999 | 10489196 |