Theres still some kinda difficult ethical problems with those. People generally want female chickens, since that's where the eggs come from (and I think there are problems with having multiple males in a flock). Unfortunately naturally you get a 50:50 ratio of males and females in the eggs. The males are usually killed shortly after hatching.

Its worth pointing out that there are methods for avoiding this, by detecting the male chicks when they're still essentially a foetus in the egg. These work so well that France, Germany and Italy banned culling chicks a few years back. Unfortunately they're more expensive than determining the chick's sex after they are hatched so other places don't do it.