ok not good, my friend who lost his chickens to chicken cholera says his chickens had the same symptoms you are describing, its a bacterial infection so chances are the guy who sold you the chickens never kept them in a hygienic environment or even inoculated them. Your roos need to get a course of antibiotics asap and watch your other chickens for the same symptoms. It takes one infected chicken to wipe out an entire flock the disease can spread through the drinking water.
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The vet just called me. He says we need to give the chickens antibiotics and stresspack in their water and see what happens. To send a carcass in for investigation cost a lot of money