Tell it your boss, simply "I observe the precept of not killing, not to encourage others and not to approve. It would be good if my person could take on tasks which do not involve such.", and simply abstain. Mental and future struggles from wrong doing are by far more hurtful and lasting then what everwhatever hardship out of earn.
Not out of causes the Buddha told that aside of killing, involvment in business with meat or living beings, does not fit well for someone after long time happiness. And what everwhatever gain, of cource needs to have it's sacrifies: why not letting go of what hurts?
[Note: this is not given for trade, exchange, stacks, but for release. For discussion and further question one is given to make use of this exit.]