One of our first cases last September was on a farm that buys in weanling bulls and finishes them as bullocks. The farmer had only bought his first batch of eight weanlings a week earlier, and had noticed a few of them coughing. The bulls were still at grass and lungworm was the number one differential. The entire herd was treated with a levamisole wormer. The coughing stopped and the farmer was advised to treat for worms again in two weeks with a clear wormer. Lesson number one is to find out the dosing history of animals bought-in and treat accordingly.
Another case from autumn 2017 was on a farm that buys weanlings and sells them at a year and a half old. This farmer always had a problem with pneumonia and was treating approximately 20% of each batch every year himself.