If we can find a better system we'll use it, but this chicken system isn't it. It relies on an all-powerful farmer with the power to arbitrarily reshape chicken society. It isn't based on getting best welfare for the chickens, and from the chicken's perspective isn't optimised for their welfare.

It would be very easy to outperform capitalism if you could find leaders who care more about the output of the system than their personal power. There is no evidence that it is possible to find such leaders, and lots of evidence that capitalism resists bad leaders for extended periods of time.