I went into the coop last night and notice that there was blood smears on the feeder, right where their combs would touch when eating. I checked all the chickens, only 2 have combs big enough to touch. Then i noticed my rooster mounting one of my girls (with a comb) and he grabs her by it to hold on! Is that normal? I also notice upon inspection that my rooster comb has black on 2 tips, frostbite? We have a very well ventilated coop. The only thing i can think of is to much humidity due to poop? I was cleaning under the rooster every week, maybe week and a half. I thought it would help add heat. Could that be the culprit? ( i do have 11 Bantams). Any thoughts? Thanks!