Lungworm: I have been speaking to some farmers who are having problems with cattle coughing, despite the animals having received a dose within the past four to six weeks. On a couple of the occasions, the product used had a relatively short period of persistency. Added to this, on one farm, the dosing gun was set for an average calf weight so there is a good chance that a sizeable number of heavier calves were under-dosed.
When dosing, always set the gun, or applicator to the weight of the heaviest animal in the group. You will be using more of the drench, or pour-on, but it will ensure that animals are properly covered. Most wormers will cost €1 to €3 per dose, but considering 1kg of liveweight gain is worth approximately €2.50/kg, it is money well spent to have calves properly wormed.