You could just genetically modify chickens to die younger, so that is their full lifespan. Unless you mean that you want them to live as long as possible, in which case you should start with an animal with a longer lifespan.
You could just genetically modify chickens to die younger, so that is their full lifespan. Unless you mean that you want them to live as long as possible, in which case you should start with an animal with a longer lifespan.