If you believe that something is absolutely morally
wrong, then the ONLY coherently explicable amount of it
you may do, and remain consistent with your belief, is
zero. If you do any of it, then you clearly do not
believe it to be absolutely wrong.

If you genuinely believe it to be absolutely wrong to
kill animals other than in provable self defense, then
you may not morally participate in any activity or
process that kills animals. If you do so participate,
then clearly you do not believe killing animals to be
absolutely wrong.

Once you've admitted that it isn't absolutely wrong,
then you're going to have a very difficult time
explaining in what way it is relatively wrong. In
particular, you're going to have an all but impossible
task to explain why the amount in which you engage or
indirectly participate is in any sense "better" than
what someone else does.