Does rescuing chickens help end chicken slavery?
It does for the individual chickens, but not for chickens as a whole.
Chickens, like cows, have been bred to be much more 'productive' than their wild ancestors, and their behaviour patterns are 'unnatural'. Obviously, in the wild there would be many more males, and the hens' eggs would be fertilised, so they would sit on a clutch to hatch them out. They wouldn't lay a new egg every day. That is a perversion of natural behaviour brought about by their human domination, through selective breeding, or 'eugenics' as it's otherwise known.
Personally, I'd like to see all human domination of other animal species become a thing of the past, like slavery. I think that it would really be better if the human-manipulated farm animals eventually became extinct, so wild animals could flourish again.
I don't want to depend on them in any way, or partake of their 'produce'. I want to see a free world.
Why eat eggs if you don't have to?