Feeding prey by weight or size?

[Felidae]

I go by size, sticking with prey roughly equal to the diameter of the snake . . . Sometimes a touch more, more often a little less. Feeding by weight, for me, has always put my adult BPs off feed. Even going by prey size, that's really only applicable for for the first two years or so with the girls -- I actually don't give my BPs anything larger than medium-smalls.

^
That.

I feed by weight, but I reduce the proportion as they grow, like this they don't go off feed.