I have six hens I adopted at 6 weeks of age from the FFA students at the high school where I teach. The girl who had them said that the five buffs had their "shots", whereas the one red-sex linked did not. Should I vaccinate the remaining chick? What "shots" was she talking about? My apologies if this question has been answered many times before the more experienced. I searched, but couldn't find a post that gave me the answer.