This is my first time raising chickens. I got 6 brown leghorns, 6 white leghorns, and 6 red sex links. One of the sex links died within the first two weeks. It never seemed to develop like the others and quit eating and drinking. I tried to save it, but it passed. The other 17 are doing tremendously! One thing I've noticed is that the leghorns are very agressive towards the other chicks.