We have starting using a product called "Cellarator Turbo" when we wean our calves. It is a 3-in-1 fast acting paste that delivers a very high level of microbials (2.5 billion CFU's per 10cc) that we feel will increase beneficial bacteria levels, which has been proven to make it more difficult for pathogens to colonize in the gut. That, along with the electrolytes, we feel helps these cattle during times of stress. For what it costs per dose, we feel it is an effective way to keep these cattle on feed and helps them during the stressful weaning process.