Yes, a vet that is obviously ignorant of ball python feeding and metabolism. I don't care if the person went to school and has the title "Veterinarian", they clearly have no idea what they are talking about in saying that you should feed a weaned rat every day! Many vets, work with mammals 99% of the time, with the occasional bird or reptile. If they even had any knowledge at all of snakes, they would understand that feeding every night is a laughable mistake. Ridiculous. Even if you do go with this strategy, a weaned rat is way too big to feed daily. You will have to feed a VERY SMALL prey item, like a young mouse, and just hope and pray the snake is in the mood to eat, with a major belly injury.
The oral injection idea mentioned above sounds more realistic. Find a new vet next time.