GMAB (is it ok if I abbreviate your name?),
I don’t believe that the world’s creatures were created to serve man; I believe that they, and everything else in the world, were created to enable people to serve Hashem. My source for this is B’raishis 1:28-30, in which Hashem tells Adam & Chava to rule the earth (and in B’raishis 9:3 people are given permission to eat meat).