I have about a 4 maybe 5 year old Jersey Giant that is very sick. Her comb has turned to a black/purplish color and she’s barely able to move. It looks like she has trouble breathing or at least is in pain. We‘ve given her Tylan 200 antibiotics for 5 days and no signs of improvement. She doesn’t eat and she drinks a little water here and there. She’s been like this for about 5 days now.