In the future I’m describing (“empathy and respect for sentient beings”), people would stop eating chickens, so they would no longer be bred. Also, modern chic

In the future I’m describing (“empathy and respect for sentient beings”), people would stop eating chickens, so they would no longer be bred. Also, modern chickens are much larger than their ancestors from even 50 years ago as a result of the efficiencies of factory farming, so I would question the premise of your question.