rescuing a birds from market

[sydney13]

I went in a live poultry market saw and they had stacks of cages with silkies, and a bunch of cornish and game hens all piled on top of each other barley moving. I want to buy some of the chickens to save them and keep them as pets in my coop.
So my question is do you think the silkies will have just as many health problems as the cornish hens do from being feed to grow so fast. I know that the cornish meat birds get lots of problems from eating so much, but if i bought one of them and then fed her a laying mix would she still get all the quick developing issues?
What breed is used for brown skin chickens?
What is the difference between a cornish game hen and a cornish hen and is the cornish breed generally docile or aggressive?
And my last question is how do I tell the difference between a male and female silkie, or do just use only females or only males for meat (i dont want to bring home a rooster)?

 

[cassie]

Cornish X have health problems not because they eat too much but because they grow too fast. They are bred to grow fast and die young. They are the best eating chicken in the world and are fine for that purpose but nothing else. Silkies do not have the health issues of the Cornish X and that would be true no matter what they were fed. There are Cornish chickens and Cornish X chickens. They are not the same thing. The standard Cornish don't have any more health problems than other chickens. A cornish game hen is a Cornish X butchered at about four weeks of age, a fryer/broiler is a Cornish X butchered at about six weeks and a Cornish roaster is butchered at about ten weeks at a weight of about nine pounds dressed.

In my opinion you are asking for trouble if you "rescue" chickens from a market. You have no way of knowing what diseases you are bringing home that may infect your other poultry, if any, and that can contaminate your premises.