I have five Cornish X chickens I got from TSC for 25 cents each. They are now 6 weeks old. They are huge. I feed them once a day and they eat it all. They get no feed at night. They have plenty of room to walk but they seem to walk to feed and drink then just lay done the rest of the time. They do not keep themselves clean even though I keep bedding fresh. And offer dust bathes. Their vents are dirty but not feces packed. Same with their undercarriage. Feathersall wet matted but not packed with stuff. The skin looks good. Heads look normal. No drainage or gue. I have not lost any. Knock on wood. No broken legs. They do look like fat out of shape guys who can't walk more than a few feet. So my question is this normal? None of my other birds look like this. They are all shiny and feathers look well kept. Next question what age or weight should I slaughter them?