Weaning is an important practice for cow-calf producers to increase calf value and performance going forward. When done correctly on the ranch, sickness in calves is very uncommon during the weaning process. From a biosecurity standpoint, never bring in outside cattle and put them with or next to calves that have just been weaned. Additionally, it is best not to mix groups of calves at weaning from the same ranch if they have been managed separately. One group may contain a BVD persistently infected calf that you don’t want to expose the other calves too, especially during weaning.