It also allowed the chicks to get used to the rest of the flock and to have access to a varied diet with plenty of bugs and greens. The disadvantages included having to put the whole flock on chick starter, since chicks cannot eat layer pellets, and the chicks were much less protected from predators. Even crows will take very young chicks. More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.