This may be a stupid question but I have a batch of Cornish meat birds that are about 4 wks old and gaining weight as they should be. I have one that I noticed yesterday that didn't seem quite right, when I went to move her she was unable to walk and both legs just stretched out behind her. I checked for injury, bruising, or any damage and could only find slight swelling in one hock. She is eating and drinking and seems bright enough but will not move. I have had meat birds before and never has this issue, I am wondering if anyone has run across this issue and if so what can be done if anything? Just at a point where I need to decide if she needs to be put down or if we can get her to butchering time.