Some of us have been raising baby chicks for going on two decades or more, and we've made much different observations and conclusions than the last two posters.
Here is my article on such observations over many years of raising baby chicks to bond early with their human care givers coupled...
The advantage of raising your own chicks on your own premises, beside having the day-olds imprint on you, is that they will develop resistance to your local pathogens during the first two weeks where their immune systems are open to producing antibodies.
Chicks raised elsewhere will not have...