I have about 13 chickens. A few of them are black sex links that were mixed with a Jersey Giant Rooster and my Barred Rock hen Since winter has come Ive doubled their feed since winter but they still look thin plus they get any and all left overs (which is an every day deal). My barred Rock hen looks like a nice fat hen but the rest of them look tall and skinny. I dont know if its the JG in them that gets tall then fat or if they are just not eating enough. I hatched them out May 25, 2009. Usually their crop is nice and full and you can visibly see it. How do you tell if a chicken is not eating enough? Another thing is I have 5 maybe 6 roosters and 6 hens. All the roosters get along. I hatched all but one out and that one I bought from a lady and hes 10 weeks older than the others. Hes the only one to crow. Ive never ever heard any of the ones I hatched out crow... Anyone know why?