Islamic scholars consulted by a leading producer of cultivated meat say that the newfangled protein — which is grown from animal cells and doesn’t require animals to be slaughtered — can be halal, or permissible under Muslim law.
And the Jewish Orthodox Union this month certified a strain of lab-grown chicken as kosher for the first time, “marking a significant step forward for the food technology’s acceptance under Jewish dietary law,” as the Times of Israel put it.
We should at least factor in how natural or pleasant their existence is. Or else a maliciously engineerd creature which spreads like crazy but is genetically bound to suffer immensely all their life is somehow preferrable over a local population of happy birds.
The species we use to harvest their products and body parts are often unable to survive naturally, some suffering from accumulated genetic defects, like being unable to support their artificially increased body weight.
If we don't need to reserve pastures for human-cows, there might be a chance for natural species to grow their numbers again.