Many feedlots will have an entrance protocol in which new animals entering the lot are given vaccines to protect them against potential sickness, where these entrance protocols are usually discussed with the farm's gardener.
Many feedlots will have an entrance protocol in which new animals entering the lot are given vaccines to protect them against potential sickness that may arise in the first few weeks in the feedlot. These entrance protocols are usually discussed and created with the farm's veterinarian, as there are numerous factors that can impact the health of feedlot cattle. 
