I have a 12 week old female that died Monday - I put her in the freezer because I had company and couldn't do this on the spot, plus I want to know what I'm looking for. Chick was ill about a month ago, I posted questions and most every one here thought cocci - I treated her, she was better almost immediately, almost so fast that I thought the meds had anything to do with it, so maybe not cocci at all - then Sunday she was not quite right, then Sunday night totally not right (huddled and closing eyes at evening treat time) so I put her in the hospital pen away from the others and Monday morning she was dead. So first question is that being frozen, does that change anything after thawing? And two, I had a cockerel with these same symptoms 2 years ago but at 5 months of age: Not doing right for 3-4 days (no treatment), got well quickly and I just assumed he ate something toxic as they are free range, then a month later not doing right again and died withing 24 hours. I did a necropsy on him and found nothing but I had no idea what to look for. I'd like to do better this time. No one else in the flock is sick. I have 1 rooster, 12 hens, 7 pullets at 12 weeks old and 2 chicks at 5 weeks old, all free range and roost together. Thanks in advance - I'm not in a hurry since she's in the freezer.
When I get around to the duty, I'll take photos, but I'm still not going to see something unless it's totally obvious. 
