So in your scenario, either cows will suffer from giving birth to brain dead children, or at least, not different from today, because we take their children to get their milk.
Brain dead mothers would be ethically ok to me but … that’s really a really strange thought and I feel that there would be unknown issues like how could you know that your cow is sick like a full bag of bacterias if the cow is not showing suffer ?
What an a odd topic.
It's a dystopian idea - breeding zombie cows that aren't alive on a cognitive level - but you can draw parallels to abortions and pulling the plug on brain dead human patients. As a society we somewhat agree rationally that the lack of subjective experience or cognition renders most ethical concerns moot.
From an emotional/intuitive stand point it still grinds a few gears though. Would we be fine with growing brain dead humans for consumption?
As I see it, if there are no emotions/emphaty then field of ethics has no use.
The relationship between rationality and emotions when it comes to ethics is really complex, and since it's in the realm of philosophy I don't think there are any clear cut answers.
If yes because it was modified during pregnancy.
What about impregnation said cow with dna modified sperm.