BI - Pour on containing permethrin and Diflubenzuron (IGR), ( insect growth regulator) for control of both biting and sucking lice on lactating and non lactating dairy cattle, beef cattle and calves. Pour 3cc per 100 lbs. of body weight, up to a maximum of 30cc (1oz) down the face and along the back. No slaughter w/d and no milk w/d.