In the past 2 days, 2 of my Cornish x have lost the ability to stand. This is my first experience with this type of problem, even though this is my 3rd batch of Cornish. Right now I have them in a large rabbit cage with food and water in easy reach. One is alert and eating, scooting some, etc. The other is lethargic, eats very little, only drinks if I dip his beak. Should I go ahead and cull them? Is there any likelihood of them regaining the use of their legs? I don't want to lose the meat because I waiting too long, but I want to still give them a chance to grow as long as possible. They will be 6 weeks on Wednesday.