I am a first time chicken owner. Having said that, in April of this year I purchased 10 Rhode Island Red baby chicks. I kept them in a brooder for several week, all the way up until I put them outside in their forever home. Everything went smoothly until these past 3 weeks. The first time something happened I opened the door in the morning and I noticed one chicken just laying there covered in chicken feces. I presume she didn't hop up on the roost the night before and her sisters, well you know. Anyways I brought her inside and cleaned her off in a warm bath. After that I dried her off, placed her in a cardboard box with some hay and water. She became more lethargic, immobile, and lifeless. I was google searching for a long time and my final presumption was that she had a blocked crop. I seen some videos and forms on unblocking it using the massaging method (quite contradictory I may add). Anyways, myself and my fiancé took her outside and began massaging her crop and trying to force her to vomit. Long story short, I am an amateur, I didn't let her vomit everything up before I sat her back up to breath. SAFE TO SAY that was a bad memory. She died because of it. SO now here I am two weeks later. I woke up to let the girls out, and one was on the roost just not moving. She stared at me and looked quite lethargic. I came back a short while later and she hopped down and went towards the watering bucket. I let her be for about another hour, then I checked again. She just looked lifeless laying under the watering bucket. I brought her inside like the last one, put her in a box, and put some luke warm water in a container for her to drink. The crop did feel a little spongy, however I am not entirely sure what I am even looking for. Anyways, I left her in the dark for a bit, until I heard some weird noises. I went in to check on her and she was almost vibrating. She looked very distraught. I let her be for about 15 minutes longer, until I heard a bang. I went in and it looked like she was having a seizure. She was banging her head off the walls and flopping around. Kinda like the floppy chicken I guess you could say. Anyways, she fell over and stopped breathing. I am quite upset about this because I keep my chickens as happy as I can. They are in an above ground coop, with a elevated watering system, along with food that is accessed by PVC piping. They have plenty of room to roam around outside, Its about a 10x16 run, and the coop is about 9x9. They get to free range once in a while, the last time was on Sunday, so it would have been 3 days ago. They were in my garden picking weeds and eating tomatoes that fell off when I harvested. Everyone of them seemed fine Sunday, Monday, and Tuesday. Just this morning there was one like I mentioned earlier. I noticed when I brought her inside she did poop, it was kind of runny and mainly white without any black. She didn't drink any water that I noticed. I just switched recently to the Egg laying hen food, its from a very reputable supplier in my area so theres no worries there. However I did keep the feed bag in the coop all summer long, It never got humid in there as I have good ventilation, but I did remove it because I worried the food was getting moldy even though I couldn't see anything. The rest of the chickens seem to be doing just fine, they are outside having a wonderful time. I live in Canada, it gets down top freezing at night now, it seems to warm up to about 13-17 degrees celsius on a nice day. Chicken coop is well insulated, although I am not worried about them being cold. If anyone has suggestions please let me know.
Ps I never noticed any worms or any dislocations in the poop. I do have a dead chicken now, so if there is some sort of way to find out what happened I am willing to handle the deceased (that is if I get quick replies).