I have an australrop that's about 6.5 years old. Normally she's our most active hen - jumping for treats and such. Found her laying on her side in a run this morning on the ground - not normal. We put her in the coop on some fresh bedding with a handful of BOSS in front of her. She ate a few. Came back two hours later and she had made her way to a covered run outside and was laying under the feeder. We got her to drink some water. She can stand and obviously can move when she wants to, but she's allowing us to hold her and she normally hates that (fyi - we have a flock of 30 chickens and this one never likes to be held, but she's not fighting it today). I was about to inject some Tylan 50 and discovered she has no breast muscle. Just her breast bone sticking up. Like someone ate her breasts and left the bones behind. Anyway I gave it to her orally instead, but I'm guessing she's simply dying of old age? We checked thoroughly and found no mites or any bugs on her. Normally we do when we find a sick chicken. She's been molting for a while but has lots of feathers currently. So many that they covered up her breast muscle problem. I see another thread where someone thinks they've got worms, but I've never dealt with that and have no idea how to tell if that's the case. Never wormed a chicken in my life. Thoughts?