I got 8 cornish from tsc,and will be 5wks tomorrow. They are out in a shed with other geese,ducks and chickens.the bigger birds are barried away from all the small guys at night.they've all been out free since 2 1/2wks There are heat lamps set up on bottom parts of parakeet flight cages.anyways,yesterday a japanese bantam roo tried mounting one of my cornish. It was barely moving,thought it was scared. Put in in the one cage thats on the floor too,only has a breeder box door opening the smallest chicks can get in(theres barred rock males,pullets and brahma orps roaming too.this morning it still hurt or something,won't walk. I know this hybrid is notorious for leg and heart problems. So i brought it in,cleaned it and put it downstairs with my 2 ee pullets.theyre 5wk old too,and very calm,even with it in the box. It still wont walk but ate and drank.Before i put it downstairs,we weighed it. 1lb12oz there might be a couple bigger ones outside,but i'd say the avg weight for all our cornish are only 2 lb. i read that at 5wk they should be 3. Now it's been cold this week,they've not been coming out the shed much to roam,can cornish be smaller because they are burning more energy keeping warm or just free roaming in general? They are fed multiple times a day and closed feeders at night.waters filled at least 4times a day too. Feed was 28% for the first few wks,we both have our birds together,they left out 24%mash,i gave them the 28%mixed with cracked corn from the adults feeder bottoms,and will be eating a bag of 22%pellets next. They're def getting more than enough protein and fat,especially for how cold it's been,i don't know why they're still smaller than average? Could they be mostly females? We can't really tell comb differences yet.