[tsimionescu]

Sure, I wasn't meaning to imply that there is no other difference, just that it's not fair to compare the meat of a mature hen (which is always going to be stringier) with "regular" chicken meat, which is harvested from non-adult birds.

Comparing free range animals with cage grown ones, the most obvious difference is going to be muscle development: animals that grow up in cages will never have much muscle mass, since they simply have no way to exercise - they will have weaker muscles, and this will be detectable as a different taste and texture. Similarly, fat deposits will often be in different places and of slightly different kinds for animals that can exercise vs those that can't.

Additionally, cage grown animals are typically also fed a cheaper diet, and the diet will always have an impact on the taste of the meat.

And yes, the cage grown animals will likely also have different health issues because of the lack of exercise and poor diet, that free range animals won't develop. But I believe the other factors will have a much bigger impact, especially since these animals are typically harvested while they are pretty young, and may not have developed too serious conditions.