What is a MBsc degree?

There's no standard degree called "MBsc". It's likely a typo or an abbreviation specific to a particular institution. It might be a variation of:

* MSc: Master of Science. This is a common postgraduate degree.

* MBBS: Bachelor of Medicine, Bachelor of Surgery. This is a medical degree.

If you encountered "MBsc" somewhere, providing the context (where you saw it) would help determine what it actually refers to.