Elanco have been publishing lots of interesting literature recently relating to transition cow management, and specifically, what they are calling "The Vital 90 Days". See the link below for one of their information leaflets.
These information sheets are provided for your interest. They should not replace veterinary advice from your veterinary surgeon.
Whilst every effort is taken to ensure the accuracy and completeness of the information provided, your specific circumstances must be discussed before advice can be given.