The step back from measurement to judgment about the welfare state of the animal involves an interpretation, which is not value-free.
He allows that in the writing of history there is a degree of subjectivity and that it can never be entirely value-free.
Such a value-free science must be combined with an appropriate end.
No one could have left the session laboring under the illusion that economics was a value-free zone.
To integrate ethical insights with the supposedly value-free knowledge of the natural, physical and (with some exceptions) social sciences.