Dan Ivascyn, the chief investment officer at fixed-income giant Pimco, isn't ready to start talking down his own book yet – despite the sharp downward moves in global bond markets since Donald Trump was elected US President.

Ivascyn, who oversees $1.6 trillion at one of the biggest bond managers in the world, said in a video update to investors that "I don't believe we are seeing the beginning of a bond bear market".