It has been very warm lately, for the time of year, and many finishing stock indoors on feeding are sweating. Consider opening doors, where possible, to aid ventilation.
Try not to over-stock pens during this period.
Some have clipped backs and tails to release some heat from stock.
This will also help if you are dosing with a pour-on. Remember when you are treating cattle for lice, you must do all the stock in the shed if it is to be effective.