Not an expert so hopefully someone else will be able to give you more info on treatment. Best thing you can do for them immediately is to get some nutrition into them. Had a poult that wasn't doing too well yesterday, so I used the mix that was suggested in the Texas forum over the weekend by chick-among-us (page 3563). They did not post ratios so I kind of just threw it together. I mixed 1 mL of nutri-drench, about 5 drops of VetRX, a crushed B vitamin tab, and about a tablespoon of honey (in place of the sugar). Then added enough warm water to make 1 cup. Syringed about 2 mL down him.
Since you have the rooster booster vitamin you could use it in place of the nutri-drench. Dosage for the nutri-drench is 1 mL per 3 lbs of bird to give it directly. Add the VetRX and B vitamin if you have it on hand. Then the sugar or honey to get them some energy.
If they won't drink it on their own, use a syringe or eye dropper to get some down them. Just put little drops on the sides of their beak, not directly in an open beak or their can aspirate (drown) on it.
