someone's life
Do you consider animals (other than homo sapiens) "people" with "natural rights" to life?
If so, then there's no way for ethical animal husbandry for human consumption.
However, my opinion is that we homo sapiens are animals, along with other ancient hominids and current high primates, and we are omnivorous predators. Our prey's opinion on its right to life is inconsequential to whether we kill it to eat it or not.
Hypothetically similar to a brown bear hunting hikers along a trail through Yellowstone. The bear doesn't care if a hiker wants to live or not; it wants to eat the human.