Take off & go-around are considered dynamic manoeuvres.
From the FCTM:
"In dynamic manoeuvres, the "bird" is directly affected by the aircraft inertia and has a delayed reaction. As a result, the "bird" should not be used as a flight reference in dynamic manoeuvres.
The "bird" is the flying reference that should be used when flying a stabilized segment of trajectory, e.g. a non Precision Approach or visual circuit."
Hope that helps.